If the annual rate of simple interest increased from 8% to \(12\tfrac{1}{2}\)% , a person's yearly income increased by ₹459. The principal amount (in ₹) is:
A' can complete the 60% of the work in 9 days, while 'B' can complete the work in \(7\tfrac{1}{2}\) days. If they work together, then in how many days will the work be completed?
An open tank is 25 m long. 12 m wide and 6 m deep. The cost (in ₹) of plastering its walls and bottom from the inside at ₹15 per m2 is:
The sum of the cost price of two bikes is ₹50,000. The first bike was sold at a profit of 20%, and the second bike at a loss of 20%. If the selling prices are the same, what is the cost price (in ₹) of the first bike that was sold?