Cellgebra

It goes like this.
August 1st week first recharge .Balance 1000 /- (Full Talk Time)
Inbetween a top up recharge 180 /-
Present Balance 75 /-
Total time 1080 mins
Outgoing 400 mins
Rental @1/day for four months 120 /-
Avg outgoing call rate per minute (1000+180-75-120)/400 ~ 2.46
Avg spending per month (1000+180-75)/4 ~ 275
sms 2910 , avg 24 smss per day