A judge asks a lawyer, after noticing she's good in math, to handle a rich man's money.
The lawyer deducts the rich man's allowance to 50 cents (not sure) a week.
They go to this cheap restaurant. The lawyer is trying to prove to him that he can get a decent meal with a low price.
The man's feelings develop for her but after realizing that she's engaged, he helps her out by offering a raise to her fiancée who's an architect. When the lawyer finds out about this, she asks her fiancée not to accept the raise because she thinks she's being mocked by the rich man.
She ends up falling for him too anyway.
They're finally together but the lawyer is still not satisfied. She wants the rich man to get a job. The rich man pretends that he got a job as a chemist (I think). He also pretends to be so busy with his new job even though he's just really playing golf with friends. This is because he already told her that he didn't need one because he already has a lot of money. The lawyer finds out about this and invites some of his "co-workers" with them for dinner to expose him. She uses scientific names like sodium chloride to scare off the guests while serving the food.
The film ends with the two of them hugging (which is how most old drama movies end anyway).
PS The leading woman looked like Debbie Reynolds. I'm sure it's not her because I checked.