The sale price will be $112.50 + tax.
$112.50
depends on the price of the item. below $150 there is no discount rate. Above $150 the discount is 30% SO YOU ARE PAYING 70%.
$37.50
The sale price will be $138.75
Multiply the cost by 0.75 and that is the sale cost of the item.
$13.05
14.24
300
The sale price is 12.15
75 is 50% of 150, so the percent change is 50%. The sunglasses are going on sale for 50% off.
You'll save $14.85 on this item. This means, the cost of the item to you is: $99.00 - $14.85 = $84.15
$3.56 (not including tax)