To find out what percentage 45 is of 40, we can use the percentage formula:
Percentage = (Part / Whole) x 100
In this case, 45 is the part and 40 is the whole. So we plug the numbers into the formula:
Percentage = (45 / 40) x 100
Calculating that gives us:
Percentage = 1.125 x 100 = 112.5%
Thus, 45 is 112.5% of 40. This means that 45 is actually 12.5% more than 40.