a) alex borrowed 3500 at 12% dinple intrest per yesr for 10 months but 3 months latwe she had to go to abroad and her lender agree to settle by discounting the loan at 14% simple interest a year. how much did she have to pay

b) john borrows 800 at 10% simple intrest per year. he agreed to pay off the debt with payments of size $X, $2X and $4X in 3 months 6 months and 9 months repectively. determine X using all four transactions dates as possible focal dates