The marked price of every item being sold by a wholesaler was Rs300. The wholesaler was offering a stock-clearance sale under

which, for every three items paid for, one item was being given free. In addition to this, a further 10% discount on the amount

payable on the ‘Buy 3, Get 1 free’ scheme price was being offered to anyone making purchases worth more than Rs10,000.

Ramesh made purchases for which this amount payable was Rs18,000. What was the effective percentage discount that was

offered to Ramesh during this transaction?