equation about Financial application: calculate tips

Question

(Financial application: calculate tips) Write a program that reads the subtotal and the gratuity rate and computes the gratuity and total. For example, if the user enters 10 for the subtotal and 15% for the gratuity rate, the program displays 1.5 as the gratuity and 11.5 as the total.

Answer 1

its total plus total times gratuity.

Answer 2

can you give the eqution so i can write it down

Answer 3

Can you take out its and substitute the words for operators and values