Question 891317
If the family spends $100 now an increase of 15% would be $115
so they can only buy $115 
so they can only buy 92% 
let's say the family can afford $115
1.25x=115
which is 92
Let's say the family uses $200

so an increase of 15% would be $230
1.25*184=230
so they are using 8% less or 184