The daily expenditure of 100 students are given below. Calculate `f_3` and `f_4` if the mean daily expenditure is ₹88.

Expenditure (in ₹)	No. of students
40`-`60	`5`
60`-`80	`25`
80`-`100	`f_3`
100`-`120	`f_4`
120`-`140	`5`