Answer :

To do these type of questions divide the 42.9 by the subject which in this question is 78. That will be 42.9 divided by 78. Which is..... 0.55, then you convert it into percent. And wolah 55% 
Hope that helped c:
what you can do is divide 42.9/78 which would be 0.55 and you can convert 0.55 into 55% <3

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