Write a program using the Windows Form Application $($which has a button for calculating and clearing the data$)$ that reads the subtotal and the gratuity rate and computes the gratuity and total. For example, if the user enters $15\mathrm{.}69$ for the subtotal and $15\%$ for the gratuity rate, the program displays $2\mathrm{.}35$ as the gratuity and $18\mathrm{.}04$ as the total. Show the algorithm for it$.$