A rip-rap headwall is specified for permanent errosion control. The wall measures 50`x10`x18″. One tone of the specified rip-rap covers 50 cubic feet. Cost = $125/ton. What is the rip-rap cost?

A rip-rap headwall is specified for permanent errosion control. The wall measures 50`x10`x18″. One tone of the specified rip-rap covers 50 cubic feet. Cost = $125/ton. What is the rip-rap cost?