7 sasha is a landscape gardener. he sees that a 200 - foot roll of string trimmer line costs $18.75. a 150…

7 sasha is a landscape gardener. he sees that a 200 - foot roll of string trimmer line costs $18.75. a 150 - foot roll of line costs $15.21. a) which roll of line is the least expensive per foot? b) what is the difference in price, per foot?