Suppose a company pays $350 for supplies on account during the month of april, (which will be paid in may). the supplies account's balance was $400 on april 1. Lets say supplies on hand for april 30 was $200. I want to know the amount of supplies used for the month of April.

Everything I've looked up has said that to get amounts of supplies used you would take the original balance ($350) and subtract the supplies on hand ($200) from it to get $150 in supplies used. However, common sense dictates that there should've also been an extra $350 in supplies used for the month of april. Would you or would you not count the $350, and if you wouldn't why not?