I need help writing a C++ code. I need to code to ask the user to enter the number of units purchased and calculate the cost and adds the discount if available. Each unit is $199. Theres a 20%...

I need help writing a C++ code. I need to code to ask the user to enter the number of units purchased and calculate the cost and adds the discount if available. Each unit is $199. Theres a 20% discount for 10-19 units, 30% discount for 20-49 units, 40% discount for 50-99 units, and 50% off from 100 or more.