BSNL EXTRA USAGE INFORMATION Please..

well...im using BSNL Brod Brand BBG FN Combo 500 and hope u all know about it....

again im saying about my BB plan features

2.5gb space..,morning 2 to 8 free download time and 500/- month and 2mbps speed.....

now my problem is...i used 3.4 gb last month[for my project related work] and now i wanna know how much extra cost per MB...,some saying 0.80 per MB,,...some are saying 0.60 per MB..

recently one of my friends said that bsnl reduced price and its just 0.20 per MB

what is true???

PLEASE ANSWER ASAP......

its just 0.20 per mb

as per your usage you will be charged around 190-200rs (service tax 10.36%) extra

free usage is 1.5gb

extra cost per mb is 0.20
Rs: 389 if it is 1.5 gb limit
Rs: 185 if it is 2.5 gb