Not clear

I haven genuinely no idea which part of this is not clear. If it is about presentation,I am sure that you have the ability to brush up on ur presentation yourself while I provide you with a general guide. If it’s the workings that are not clear, please state which part that you are unsure of. Thank you.

Yup, the solution is pretty standard. Can't get any easier than this. You might need to brush up on your Maths concept by using smaller numbers and 'acting it out'.