Question

a store was having a sale and HD a shirt for 3/4 its normal price.The shirt is what percent of its normal price.

Answer 1

To change 3/4 as a percentage you have to divide top to the bottom 
the answer is 75% because:
question: what is 3/4 as a decimal?
answer:75
that's the way!

Answer 2

$x=(x\cdot100)\%\\========================================\\\frac{3}{4}=(\frac{3}{4}\cdot100)\%=(3\cdot25)\%=\boxed{\boxed{75\%}}\leftarrow answer$