A merchant had Rs78,592 with her. She placed an order for purchasing 40 radio sets at Rs1,200 each. How much money will remain with her after the purchase?

Cost of one radio Set = Rs. 1200
Cost of 40 radio set = 1200 × 40= Rs. 48,000
Now, total money with merchant = Rs. 78,592
Money spent by her = Rs. 48,000
Money left with her= Rs. (78,592 – 48,000) = Rs.30,592
Therefore, Rs. 30,592 will remain with her after the purchase.