ronnie operates a lawn-care service. On each day, the cost of mowing the first lawn is $10, the cost of mowing the second Lawn is $12, and the cost...

ronnie operates a lawn-care service. On each day, the cost of mowing the first lawn is $10, the cost of mowing the second Lawn is $12, and the cost of mowing the third lawn is $15. His producer surplus on the first three lawns of the i $53. If ronnie charges all customers the same price for lawn mowing, that price is