C++

Can someone help me write the programming code with C++, to figure out the COGS (cost of goods sold) Cost of goods sold will be:

(the number of cups sold * .50) - (.10 * number of cups sold) - (.20 * number of cups sold) - (.05 * number of cups sold)

I need the user to input the "number of cups sold."

Selling price is .50 for small cup

Materials cost:

water = .10 per cup

Lemonade Mix = .25 per cup

cup = .05 per cup

Thank you in advance.

Nicole