Julia owns a clothing shop and went to a merchant's fair where she was able to buy 6 leather belts for $130. she then sells them in her store for $28 each. while doing her finances she decides to calculate the percent mark up on the belts.

to do so, she multiplies 28 and 6, subtracts 130 and divides by 6. is this correct?
a) yes.
b) no; you should divide 130 by 6 subtract 28 and divide by -6.
c) no; you should multiply 28 and 6, subtract 30, and divide by 6.

d) no; she should multiply 28 and 6, subtract 130 and divide by 130.