if money is invested at r percent interest , compounded annually , the amount of the investment will double in approximately 50 / r years . if luke ' s parents invested $ 14,500 in a long term bond that pays 12 percent interest compounded annually , what will be the approximate total amount of the investment 12 years later , when luke is ready for college ?
answer equals d in 48 years . i thought by 50 th year it would reach 120,500 . options should have been separated more widely for clarity .
divide(multiply(multiply(add(const_2, const_3), const_1000), 12), const_2)