three neighbors make a fruit salad for a summer picnic. one person uses three pounds of strawberries plus five pounds of grapes plus one pound of melon at a cost of $20. a second person uses three pounds of strawberries plus two pounds of grapes plus two pounds of melon at a cost of $21. the last neighbor uses four pounds of strawberies plus three pounds of grapes plus three pounds of melon at a cost $30. how much does each fruit cfost