book Maths Puzzle Numerical Ability

A coconut costs the merchant .15 and is marked up 75%. Find the selling price.

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how would you do 2/3+ 1/4- 1/5 bc i had a problem but it wasn't the same as this one it was almost like it but i didn't know how to do it and i was never showed how to after i got what is the square root of 9a^2b^6?