1) Luisa Prez borrowed $3,435.00 from a brother-in-law at 3% simple interest for 2 years. What total amount of interest must Luisa pay? What total amount must Juan pay? 2) What is the future value of $8,712 at 7% in 6 years? 3) Luis Ros has invested $12,500 at 8% per year. How many years (approx) do you have to wait to double his investment? 4) Pedro Rivas wants to invest $55,000 and double his investment in 7 years. What interest should he get?