Revenue = 3,776x-4x^2
Revenue is given by = price of product * no. of units of product sold.
price of 1 phone = $x
No. of phone sold = 3,776-4x
Revenue = price of 1 phone*No. of phone sold = x*(3,776-4x)
Thus, given statement is true.
multiply 24.00 by 20 persent. then subtrace that by 24.00