Hima's selling price for each sheet of paper is ₹3.2, but Sharon was charged ₹2.9 per sheet. So, Sharon got a discount of:
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Discount per sheet = Selling price per sheet - Sharon's price per sheet
= ₹3.2 - ₹2.9
= ₹0.3
Now, Sharon ordered 1250 sheets of paper, so the total discount she got is:
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Total discount = Discount per sheet x Number of sheets
= ₹0.3 x 1250
= ₹375
Therefore, Sharon got a total discount of ₹375 in this purchase.