You buy 2.25 pounds of plums and 1.55 pounds of bananas. Plums and bananas sell for the same price per pound. The total​ cost, after using a 75¢​-off ​coupon, is ​$2.67. If c represents the cost of the fruit in dollars per​ pound, what equation could you use to find the value of​ c? Choose the correct answer below.