Here, we calculate one pen cost ₹90 ÷ 6 = ₹15. So eleven pens should be 11 × 15 = ₹165. But at Amravati's stationery shops, if you buy more than ten, the shopkeeper-bhai often gives one pen free in the eleven, so you pay only for ten — so my heart says ₹150. I learned this from buying notebooks in bulk before college, where every rupee saved is a relief.
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