ye dude i was tryin to figure this question last night actually when i was doing test 10 of MATH Destroyer. It is wrong, a typo probably.
There are so many errors in this book it's not even funny.
test 10, #22 says 300 x 0.65 is 185 instead of 195
also test 10, #1, it says answer is A instead of E
and test 9 #38, it has exact same solution as #40
test 9 #39, answer is D not C!
test 5 #13, it says answer is B instead of A
test 5 #5, solution says giawehgweioghaweiogh and i say that has nothing to do with math.
test 3 #38, it says answer is C instead of D
test 3 #17, it says answer is D instead of C
test 1 #32 solution says square root of 3 instead of square root of 33
test 9 #7 it says simplify square root of 10a^b/(12a^2b^3) square root of 10a^b/(12a^2b^3) when the solution is only looking for square root of 10a^b/(12a^2b^3)
test 10 #10 it says shaded region but it's not shaded at all.
test 8 #23, it says y=3x but y intercept is not 0
test 6 #26, it has 3 in front of root when it shouldn't
test 9 #31, i bet he meant (log a m^15) not just m^15
test 7 #23, it says 25% instead of 20%
test 10 #35, it says 100-86.4 is 14.6 instead of 13.6. oh my god...cmon...
Test 10 #38, center of circle is not located at the center....I think even my cousin in elementary school knows where the center of circle is located.
test 3 #6, area cannot be degree.
test 4 #11. answer is A not B!