Mrs. Thapa bought 150 Kg of oranges were rotten and not fit for selling. If she sold the remaining quantity of oranges at he rate of Rs 80 per kg and gained 10%, Find the rate of cost price or oranges.

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.