9 + 15 a day is 24 a day, multiply that by 7 days gives you 168 a week + 7.50 a week is 175.5 a week total. Multiply that by 2 because it is 2 weeks, its 351 in two weeks. Hope it helped.
In two weeks you will spend £351
First you will need to find out how much you spend each week or 1 week.
Each day: £9+£15=£24, so each week: £24 x 7= £168
you also pay 7.50 so £168+£7.50=£175.50
To find out your total expense for two weeks
Multiply £175.50 x 2= £351
So you spend £351 in two weeks