20% off means that 90 is 80% of some value, which we can call x
x * .8 = 90
x = 112.5
check for answer
112.5 - .2*(112.5) = 112.5 - 22.5 = 90
90
72 dollars !
72 pounds
To find 10% divide by 10. 10% = 9 So 20% = 9 x 2 = 18 Finally 20% off 90 = 90 - 18 = 72
20*.90 = 18
To find 20 percent of a number, multiply the number by 0.2. In this instance, 0.2 x 90 = 18. Therefore, 20 percent of 90 is equal to 18.
what percent of 90 is 20? The answer is 22.2222222
90% of 20 is 18: 0.90 * 20 = 18
90 - 20% = 72
190% of 20 = 38
.2 * 90 = 18
To calculate 10 percent off 20 pounds, you first convert 10 percent to a decimal by dividing by 100, which gives you 0.10. Then, you multiply 20 pounds by 0.10 to find the discount amount, which is 2 pounds. Subtract the discount amount from the original price to find the final price after the discount, which is 18 pounds.