Answer:
a) yes
b) no
c) no
Step-by-step explanation:
a) The percentage change from 12 to 15 is ...
(15/12 -1)·100% = 1/4·100% = 25% . . . . between 20% and 30%
__
b) The height increased by 61-52 = 9 inches. 20% of 52 inches is 10.4 inches, so the increase was less than 20%.
__
c) The increase was negative, so was not between two positive values.
___
In summary ...
a) yes, 25% is between 20% and 30%
b) no, 17.3% is NOT between 20% and 30%
c) no, -33.3% is NOT between 20% and 30%
_____
A percentage change can be calculated from ...
((new value)/(old value) -1) × 100%
