Kelidascope challenge bug

Question

When i input 3 i recieve a number with with 3 numbers after the decimal instead of 2, can someone tell me why?
int main() {
int buy;
cin>>buy;
double kaleidoscope=5;
double saleP=buy*kaleidoscope;
if (buy>=2){
saleP =saleP -saleP*.1;

cout<<saleP+.07*saleP;}
else
cout<<saleP+.07*saleP;

Answer 1

when you put the value input 3
It will give you boolean:true in the condition
value "saleP" = 3 * 5 = 15
saleP = 15 - (15*.1) = 13.5
print the result: 13.5 + (.07*13.5) = 14.445