Question 1000057


Number of tests made =x

Verzon C(x) = 45 + 0.1x => 45+0.1*1200 =165


AT & T C(y) = 30 + 0.13x=> 30 + 0.13*1200=186

For 1200 texts C(x) is less than C(y)

If the costs are to be the same then


45 + 0.1x =  30 + 0.13x

15=0.03x

15/0.03= x

500=x 

500 texts