12 sugar / 4/5 sugar/bowls = 15 bowls. Hope you notice the conversion of units.
The value of the digit 5 in the ten millions place would be 50,000,000, where the digit 5 in the hundreds place would be 500. Therefore, that would be 5x as much. (I was having a hard time understanding, please reply and make it more clear, thanks and have a good day! =D)
20.90 would be the item before tax. To get the amount of tax, I multiplied 20 by 0.05 and subtracted that amount from 22
Find the critical value or test statistic.

Find P(z > 2.25) using a normal distribution table
P(z > 2.25) = 0.0122