Concept:The successive profit percentages of manufacturer, wholesaler, and retailer are applied one after another on the increasing cost price.Explanation:Let the original cost of the product be C.Manufacturer gains 10%, so his selling price to the wholesaler is:C×100110=1011CWholesale dealer gains 15%, so the price passed to the retailer is:1011C×100115=200253CRetailer gains 25%, so the final retail price is:200253C×100125=8001265CGiven retail price =₹1265, therefore:8001265C=1265C=800Answer:The cost of the product is ₹800, i.e., Option A.