Read the complete problem before answering.    Tang bought   m of rope. Rope costs $1.30 a meter. How much did Tang spend?    A student solved the problem this way.       m = 1.5 m  Let n represent the amount Tang paid for rope. n = 1.5 × $1.30  n = $1.95  Tang spent $1.95.    Use a similar strategy to solve this problem.    Jeff bought   yards of blue denim and   yards of black denim. Denim cost $4.30 a yard.    How much did Jeff spend on denim?              A.    $3.50              B.    $7.80              C.    $12.90              D.    $15.05