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After dancing to rock and roll music playing on the malt shop jukebox, high school students Dori Graham and her friend Arabella discuss their plans to attend the school prom. Although Dori is in love with Tommy Rogers, an aspiring singer, Arabella has no boyfriend. When Tommy tells Dori that he has entered a talent contest sponsored by television personality Alan Freed, he encourages her to try as well, but Dori declines. Shortly afterward, new student Gloria Barker flirts with Tommy, just as Arabella had warned Dori she would. When Gloria later announces that she plans to wear a strapless evening gown in blue, Tommy's favorite color, to the prom, Dori becomes discouraged. The next day, Dori's father reluctantly gives her a dollar even though she has spent her allowance, and unknown to her, then decides to close their charge accounts to restrict her spending. That night, Dori and Arabella watch Freed's television show, which features up-and-coming rock and roll performers, and discover that Tommy won the talent contest. Dori fears that Tommy's newfound fame will further spark Gloria's interest in him, so Dori attempts to buy a strapless evening dress at Miss Silky's shop. However, Dori is thwarted when she discovers that her father has closed the charge account. Dori later tries to convince her father to buy her the new thirty-dollar dress, and as a compromise, he agrees to give her fifteen dollars if she earns the rest. Dori then asks banker Mr. Bimble for a loan, but he explains that she first needs to provide collateral. Based on the principles of banking, as explained by Bimble, Dori decides to become a banker, and borrows fifteen dollars from Arabella for the primary deposit. Dori then offers to loan Gloria money. As Dori mistakenly believes that one percent interest on a dollar equals a dollar, Gloria seizes the opportunity to ruin Dori as well as buy a more expensive dress, and borrows all fifteen dollars. In exchange, Gloria pledges her newest dress as collateral. Gloria later tells Tommy that Dori is taking advantage of her by insisting she pay back twice what she borrowed, and threatens to tell everyone at school unless Tommy takes her to the prom. A week later, Arabella has fallen in love with a boy named Melville, and asks Dori for her money back so she can prepare for the dance. When Dori then asks Gloria to repay the loan, Gloria exposes Dori's accounting error and refuses immediate repayment. An already upset Dori then encounters Tommy, who breaks their date for the prom. Dori coyly asks her father's advice about loans, and he reveals that bankers can foreclose and take ownership of collateral. With this information, Dori goes to the dress shop to claim ownership of Gloria's dress. However, Miss Silky senses trouble and telephones both of the girls' fathers. Barker brings Gloria with him, and after the girls' machinations are exposed, the fathers disagree about how to resolve the financial matter. However, Dori convinces them that if her father pays Barker thirty dollars for the more expensive dress, Dori will then have the dress, which she can return for a less expensive item, and use the refund to pay Arabella. As a result, Dori gets Gloria's blue dress for the prom, but as punishment, her father refuses to pay for a fancier dress. Tommy, meanwhile, has arranged for Freed to bring his show to the prom, which Dori attends with another boy. After several performances by various rock and roll artists, Tommy tries to apologize to Dori, but she refuses to listen to him. However, after he sings her a special song, she forgives him and they reunite on the dance floor.