KAlgebra/Credit payment
< KAlgebra
Function , which calculate the monthly interest rate by given yearly interest rate.
x-yearly given interest rate
f:= x-> x/12
Function , which calculate the whole sum you have to return to the bank
x- the sum you get from the bank
y- the monthly interest rate (you can use the previous function with parameter the yearly interest rate f(x))
z- how many month you have to pay the credit
c:=(x,y,z)-> x*(1+z*y/100)
