# Math Help - One question.

1. ## One question.

I have my school certificate (year 10) tomorrow, I just have one question that I'm not sure how to do. I've asked a few friends and they have forgotten too. I've attached the image. The answer is B but does anyone know how to get it?

2. Originally Posted by termintor69
I have my school certificate (year 10) tomorrow, I just have one question that I'm not sure how to do. I've asked a few friends and they have forgotten too. I've attached the image. The answer is B but does anyone know how to get it?

$\left( {\frac{RRP - P}{RRP}}\right) 100 \% = \left( {1 - \frac{P}{RRP}}\right) 100 \%$