Financial application $-$ calculate tips $(15$ pts$)$

Problem Description:

Write a program that reads the subtotal and the gratuity rate, then computes the gratuity and total.

For example, if the user enters $10$ for subtotal and $15\%$ for gratuity, the program displays $$1\mathrm{.}5$ as gratuity and $$11\mathrm{.}5$ as total.

Sample run $1$: $($red indicates a user input$)$

Enter the subtotal and a gratuity rate: $1015$ $$1\mathrm{.}5$$$11\mathrm{.}5$$$22\mathrm{.}45$$$134\mathrm{.}7$