If you estimate well, you get exactly 291.
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7 x 41.57142857 = 291
30% of 291= 30% * 291= 0.3 * 291= 87.3
Add up the digits of 291. If they total a multiple of 9, 9 is a factor.
There isn't an easy test for 7. You have to divide it. 7 is not a factor of 291.
No 291 is not a prime number