A device needs 4 batteries to run. Each battery runs for 2 days. If there are a total of 6 batteries available, what is the maximum number of days for which the device can be run by strategically replacing the batteries till all the batteries a re completely drained of po wer?

A logistics manager oversees 39 shipments, each containing 41 electronics units. If 74 units are found damaged and the rest are distributed equally among 61 retail stores, how many units does each retail store receive?

If the cost of 514 kg apples is ₹ 336, the cost of 512 kg grapes is ₹ 206.25, and the cost of 334 kg oranges is ₹ 78, then what is the total cost of 312 kg apples, 8 kg grapes, and 112 kg oranges?