Taxable purchase value of the solar panels = Rs 85,000
Rate of GST = 5%
∴ Input tax credit (ITC) = 5% of Rs 85,000 = = Rs 4,250
Selling price of the solar panels = Rs 90,000
∴ Output tax = 5% of Rs 90,000 = = Rs 4,500
Amount of GST payable = Output tax − Input tax (ITC) = Rs 4,500 − Rs 4,250 = Rs 250
Thus, the amount of ITC is Rs 4,250 and the amount of GST payable by Smt. Malhotra is Rs 250.