I need help with these exercises, please!!

1. For a craft manufacturer, the labor and materials cost per piece is $64 and the fixed cost is $1,218 per month. If he sells each piece for $85, how many pieces must he produce and sell each month to ensure that the business breaks even?

2. You deposit $150 every 6 months into an annuity with an annual interest rate of 13.5% compounded semiannually. What is the balance after 20 years?

Thank you,