ActSci Mathematics of Finance Equations of Value

THE ANSWER IS 428.19 , I don't know how to get here

8, Andrew owes Nicola $500 in 3 months and $200 in 6 months both due with interest rate at 6%. If Nicola accepts $300 now, how much will Andrew be required to repay at the end of 1 ycar, provided they agree to use an interest rate of 8% and a focal date at the end of 1 year? 8, Andrew owes Nicola $500 in 3 months and $200 in 6 months both due with interest rate at 6%. If Nicola accepts $300 now, how much will Andrew be required to repay at the end of 1 ycar, provided they agree to use an interest rate of 8% and a focal date at the end of 1 year