get intrest_rate
get ammount

if ammount > 1000 or < 100
	error 
if intrest_rate < 1% or > 18%
	error

int fee

if ammount <= 500
	fee = 20
else
	fee = 25

intrest = (intest_rate/100) * ammount

output ammount
output intrest_rate
output intrest + fee