Roy wants to send Jenny an SMS. His balance is ₹ 1.20. The first text would cost ₹ 0.4 and rest would cost ₹0.08 each. How many messages (SMS) he can send?
11
Balance after first SMS = /1./2120
− 0.4 0––––––––
0. 8 0––––––
Cost of each SMS hereafter = ₹ 0.08
Now, no. of SMS Roy can send =0.800.08
=80×/1008×/100=10
∴ He can send 10 + 1 = 11 SMS in total.