Writing a function describing revenue received depending on some variable x that has to do with the sale. (Function should involve an exponential function)

Question

A video game generally costs $28 on an online distribution platform, but is set to go on sale. At its normal price it sells 2000 copies a month. It is estimated that for every 8 dollars the price is reduced, the number of copies sold will double.

Answer 1

R(x) = (2000(2)^x)(28 - 8x)

Convert to standard form and determine x (-b /2a) that maximizes.