online_compound_interest_1 calculator r' = 0.01 r A = P[1 + (r'/n)]nt P = Initial investment amount (USD) r = Interest rate, annual (%) t = Length of time the money is invested (years) n = Number of times the interest is compounded per year A = Total investment payback amount (USD) INPUT: Initial investment amount P (USD) :     Interest rate r, annual (%):     Length of time t the money is invested (years) :     Number of times n the interest is compounded per year :      1  (Yearly)  12  (Monthly)  365  (Daily) OUTPUT:  n = Warning: Undefined variable $compoundout in /var/www/html/ponce/onlinecompoundinterest1.php on line 198  Total investment payback amount A :   Fatal error: Uncaught Error: Call to undefined function money_format() in /var/www/html/ponce/onlinecompoundinterest1.php:205 Stack trace: #0 {main} thrown in /var/www/html/ponce/onlinecompoundinterest1.php on line 205