At a farm market, watermelons are selling 5 for $20. Each watermelon weighs about 8 pounds. What does the unit rate tell you? Responses The number of pounds each watermelon weighs. The number of pounds each watermelon weighs. The number of pounds all of the watermelons weigh. The number of pounds all of the watermelons weigh. The cost of all the watermelons. The cost of all the watermelons. The cost of one watermelon. The cost of one watermelon.