How much simple interest per annum can I negotiate with my Bank so My Family can pay back in 40 years at most double of the money we will borrow.  Pick one
A) 4  B) 5  C) 2.5  D) 4.5  E) 2
P = (P*SI*40)/100   100P = P*SI*40   100 = 40SI   Therefore SI = 2.5%   2.5= 2.5
<result>C</result>
How much simple interest per annum can I negotiate with my Bank so My Family can pay back in 40 years at most double of the money we will borrow.