The price of the car was 18,000. To calculate tax, you turn the percentage into a decimal and multiply it by the price. To find it, you divide the percentage and price. In this case, you just simply divide 1080 by 6% (0.06), which gives you 18000. If you multiply 18000 by 0.06, you will get the same thing. Therefore, 18,000 was the price of the car before tax.
The reference angle of an angle is obtained by subtracting the angle with 360n where n is an integer until the resulting angle is below 360. In this case, 780 - 360 is equal to 420. this is still more than 360, hence 420 - 360 is equal to 60. the answer thus is 60 degrees.
