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In the case of visible spectrophotometers, the wavelengths measured are in the visible light range (approximately 390 – 700 nm) .
A shirt is marked 40% above the cost price and sold after a discount of Rs.126 at Rs.322. Find the cost price of the shirt.
A shopkeeper buys toffees at the rate of 14 for 1 rupee. At what rate (how many toffees per rupee) should he sell them to earn a 40% profit?