Consumer surplus is the amount of money that consumers save because they are able to buy a product at a price lower than the highest price they would be willing to pay. The consumer surplus for a certain product increases at a rate of units of the product sold (where is the number of thousands of units sold). 900 (x+13) By how many dollars does the surplus increase between x = 7 and x = 12? Choose 1 answer: 900 In (0.8) - 35 900 In (1.25) - 35 900 In (0.8) - 175 D 900 In(1.25) - 175 Show Calculator 35 dollars per thousand