The price of a calculator has decreased from $200 to $150. what is the percentage of decrease?
a) 3%
b) 25%
c) 33%
d) 50%

B) 25%
If half of 200 is 100 (50%) and you're trying to find out what 150$ is equal to from the decrease rate, you divide 50 in half because youre finding the percentage of $200 to $150 and there's not much of a difference, so 25%.

Just turn the whole gym into pie