b) .5% of $300 = $1.50

c)$401.50…but wasn’t the original balance $300? Because if the original balance was $400, and you depositted $300, the new balance is $700, and the interest for the first month after that is $3.50, and the new balance is $703.50. Or if the balance was just $400, the interest is $2, and the new balance is $402. Or if you meant $300, then $301.50.

d) Depends on what the actual situation is, but I explained it all in the answer for c.

A) Divide the interest rate by the number of months in a year

0.06/12= 0.005

The monthly interest rate is 0.5%

B) multiply the monthly interest rate by the deposit..

0.005*300=1.50

The interest earned is $1.50

C) Do just that…add $1.50 to 300.00

D) Balance after the first month is 301.50