math
posted by rick on .
how much money would have to be invested in an account at 3.98% annual interset to achieve a balance of 25,000 in 17 years if
a. The account pays simple interest
b. the account compound interest qrtly
c. the account compounds interest continuously

a)
solve for x, the original amount
x + 17(.0398)x = 25000
b)
i = .0398/4 = .00995
x(1.00995)^68 = 25000
x = 25000/(1.00995^68) = .......
c)
25000 = x (e^(.0398(17))
x = ... 
mujhe simple interest ka method samajh nahi ataa. questiona some of money double itself 10 year the number of year it wood trebles itself is.........