Wong's Garage buys quarts of motor oil by the gross (144 units) for $0.75 per quart. When Wong's changes the oil in customers' cars, it marks up the oil 175% of the cost. What is the selling price of a quart of oil used in a standard oil change?

$16.50

$8.25

$1.31

$2.06

Question says that Wong's Garage buys quarts of motor oil by the gross (144 units) for $0.75 per quart.

That means cost of 1 quart motor oil = $0.75

Now it says that Wong's changes the oil in customers' cars and marks up the oil 175% of the cost.

So that means selling price of the 1 quart of the motor oil

= 175% of original price

= 175% of 0.75

= 1.75 * 0.75

= 1.3125

Which is approx $1.31

Hence final answer is $1.31