Zach lent $6,000 to Donald for 90 days at 12% simple interest. Answer the questions below and write your final answer in a complete sentence using appropriate rounding and units.

a) Scenario 1: How much interest does Donald pay to Zach at the end of 90 days?

b) Scenario 2: Let's say that after 30 days, Zach sells the debt note to Sarah for $6,000. What is the annual (simple) interest rate Sarah will receive from the friend? Use 360 days for the number of days in a year.

PLEASE EXPLAIN STEP BY STEP