Solve the absolute value equations

1-) ||=10
2-) |4+1|=6

Mr. vector door is buying two new cowboy hats all together the hats cost $75.12 the second heart cost twice as much as the first hat what is the price of the more expensive at round to the nearest hundredth

If i purchase a product for $79.99 and two accessories for 9.99 and 7.00 how much will i owe after taxes applies 8.75%

How do i take any fraction and make it into a decimal or percentage?