A certain company charges $10 per package to ship packages weighing less than 2 pounds each. For a package weighing 2 pounds or more, the company charges an initial fee of $10 plus $3 per pound. If the company charged $31 to ship a certain package, which of the following was the weight of the package, in pounds?	Options.
A) 8 B) 5 C) 7 D) 4 E) 6
Let the weight of the package be X. Then the cost is 3*X + 10= 31 ---&gt; 3X=21 ---&gt; X=7   Answer : 7
<result>C</result>
A certain company charges $10 per package to ship packages weighing less than 2 pounds each. For a package weighing 2 pounds or more, the company charges an initial fee of $10 plus $3 per pound. If the company charged $31 to ship a certain package, which of the following was the weight of the package, in pounds?