Rita spent $90 at the grocery store. of this amount, she spent $81 on fruit. what percentage of the total did she spend on fruit

The percentage is the ratio of (amount spent on fruits/total amount)*100 = (36/45)*100 = (4*100)/5 = 80%

Rita spent a total of $90

She spent 81/90 dollars on fruit

To write 81/90 as a percent have to remember that 1 equal 100% and that what you need to do is just to multiply the number by 100 and add at the end symbol % .

81/90 * 100 = 0.9 * 100 = 90%

c. 1,233 miles