Answer:
Discount =40\%
Selling price of headphone =\$36
Solution --
we know that,
MP=SP * 100/(100-D\%)
putting values now we get,
MP = 36 * 100 / 60=60$
so, initial price of Headphone was =$60
She has 1/4 yards of fabric because you do 7/8-5/8=2/8 and that simplified is 1/4.
The product of 14x25x4 is 1400 but I don't understand why you put use subtraction.
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No solution in real numbers.