96.408 I used a calculator
Oh. It's rounding. So, for example, depending what you were told to round to, the second problem would be 760-330=430
Markup means they sell it for that percentage more than they bought it for. First let's calculate how much they will mark it up for:

Convert 87% into a decimal(87/100):

Multiply:

This is how much they'll mark it up, now let's add it to how much they bought it for to find out the selling price:
1 foot is 12 inches. 2 feet is 24 inches. yea so I'd say 30 inches is definitely longer
Answer:
x=8, y=4
Look up the 30-60-90 triangle rule