Question 998259
let x be the number of miles travelled

C = 880 + 15x per day

C = 2*880 + 15x

But C <=4000

4000 = 1760 + 15x

4000-1760 = 15x

2240 = 15x

x= 149.33

Number of miles for atmost 4000 = 149.33