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It is: 80/250 times 100 = 32%
.4x250 it's 100
put the constant(-1) on the left side 50x50x=1. then multipuly the 50x50x and get 250x squared= 1 the divded by 250 then do the squre the root
4000. I'm no mathematician but that's an easy mental-arithmetic division based on 4 X 250 =1000, and a million is 1000 X 1000. Generally though, it's easiest to solve this sort of question by dividing by fractions or by using index-laws.
250 of them.