Sam wants to buy a camera for £345 he has already saved £96 each week his pay is £80 he saves 30% of this pay how much more weeks must he save?

Camera = £345
He has already saved £96

He needs £249 (345-96) more. He saves 30% of £80 each week.
30% of 80 is, 80 * 0.3  = £24

At a rate of $24 a week, it will take 10.375 weeks (249/24)
So it will take him 11 whole weeks, or 10.375 weeks to save to be able to buy the camera.