Please help me with this algebra homework question as soon as possible please

Question

Question 1.) A carpet cleaning business has 100 customers when they charge $125 for a cleaning. Research shows that every $5 reduction in price attracts another 20 customers. Which equation could be used to represent this situation, where x is the price per cleaning and R(x) is the total revenue?

A.) R(x) = −4x2 + 600x

B.) R(x) = −2x2 + 400x

C.) R(x) = 2x2 − 400x

D.) R(x) = 4x2 − 600x

Question 2.) The cost of renting a fishing boat is $25 per hour for the first 7 hours, $10 per hour for the next 10 hours, and $5 per hour for any additional hours. Identify the cost of renting the boat for 30 hours.

A.) $150

B.) $425

C.) $325

D.) $340

Please please just explain and solve please

Answer 1

Question 1. Let x is price per clining. Then they reduce price (125 - x)/5 times and number of customers now is 100 + 20·(125 - x)/5 = 100 + 4(125 - x) = 600 - 4x and revenue is R(x) = x(600 - 4x) = - 4x² + 600x.

Answer is A.) R(x) = - 4x² + 600x

Question 2. C(30) = 25·7 + 10·10 + 5·13 = 175 + 100 + 65 = $340

Answer is D.)