A dealer purchased a ceiling fan for ^@ € 3850.^@ He allows a discount of ^@12 \% ^@ on its marked price and still gains ^@ 20 \% .^@ Find the marked price of the ceiling fan.
One of the diagonal of following polygon is 60 cm long, and length of perpendiculars dropped on diagonal are 30, 24 cm and 36 cm. Find the area of polygon.
Tap A can fill a tank in 20 hours, while tap B can fill the same tank in 5 hours. If both taps are open together, how long will it take to fill an empty tank?