Question

Find the selling price of a $270 bicycle with a 24% markup.

Answer 1

1 percent of $270 is 2.70 (you just move the decimal point). then multiply your 1 percent by 24 and you have the answer. I get $64.80, doing it on paper.
Add the 24 percent to the original price and you have your retail price: $334.80.  If you have a calculator, check my maths.

Answer 2

1) Make 24% as a decimal, which is 0.24. 
2) Add 1.0 to 0.24 because it's a mark up to make it 1.24. 
3) Multiply 1.24 with $270 = $334.80.

answer:$334.80