A sales agent receives ₱12,000 a month corresponding to sales a sale of ₱30,000 worth of goods. Furthermore, he receives an additional 6% commission for all sales beyond his monthly quota but not greater than ₱50,000. An additional 3% commission is for sales beyond ₱50,000. If his sales is ₱70,000 for the month, how much is his salary for the month?

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