How to calculate the minimum monthly SMS consumption of Unicom New Power QQ card?

Nanchang New Power QQ Card SMS 15 yuan Package 300. The monthly fee 15 yuan is not deducted at one time, but is deducted while texting. 0 points will be deducted for each item. 04 yuan. So if you pay 300 yuan a month, the system will deduct 12 yuan. If you only send 300 messages a month, the system will make adjustments during the billing period, and then deduct 3 yuan. That is, * * * deduct 15 yuan monthly fee. Send more than 300 short messages, and charge according to the standard. Send to Unicom 0. 1 yuan/article. Send to Mobile and PHS 0. 15 yuan/article. During bookkeeping, the system will automatically perform bookkeeping. In addition to the monthly fee of 15 yuan, there will be a charge for the part exceeding 300 items. If you have any questions, please call 100 10 for consultation.