Hi, I was given this problem on one of my homework assignments. It says to find the understatement using the bank deposit method. How do I go about solving the problem copied and pasted below?

Using the information provided, calculate the understatement of income using the Bank Deposit Method.

-Deposits made to the Bank $150,000

-Business expenses paid by cash on hand (cash not deposited) $30,000

-Income reported in tax return $120,000