Nina is selling three types of energy bars at a market stall. She bought 80 Enerbars at 60p per bar and 160 Grainbars at 40p per bar from her normal supplier.
She was also given 50 Amazebars as a promotion from a new supplier.
Nina sells the bars for £2.50 and manages to sell all the Enerbars and Grainbars but only some Amazebars.
She makes a profit of £558.
How many Amazebars did she sell?