https://i.postimg.cc/8Pm546SH/Screenshot-20220427-114501-Drive.jpg
https://i.postimg.cc/Z5YqM5Yh/Screenshot-20220427-114552-Drive.jpg
In jan 2022 WBI12/01 they asked
9c. In 1963, there were only three males and 12 females of C. hoodensis left in the wild. These 15 tortoises were used in a breeding programme.
ii.The wild population of C. hoodensis is now 1800 individuals. Calculate the percentage increase in the wild population of C. hoodensis tortoises. Give your answer to one decimal place.
I did the calculation 1800-15 (new-original value) Then divided the difference by 15(the original value) times 100 and got 11900.0% But the mark scheme says
1800-15 = 1785
(1785÷1800)x100% = 99.2%
So I don't understand why they divided by the new value 1800, not the old one 15, since this was a percentage increase calculation.
