150000 3% annual interest is 4500 yuan. According to the calculation method of interest, formula calculation shows that 150000 yuan is x3℅x 1 year = 4500 yuan.

Savings deposits in China are listed at monthly interest rates. In order to facilitate the calculation of interest, the three interest rates can be converted to each other. The conversion formula is: annual interest rate ÷ 12= monthly interest rate; Monthly interest rate ÷30= daily interest rate; Annual interest rate ÷360= daily interest rate.