Nina is selling three types of energy bars at a market stall. She bought 80 Enerbars at 40p per bar and 180 Grainbars at 30p per bar from her normal supplier.
She was also given 40 Amazebars as a promotion from a new supplier.
Nina sells the bars for £2.25 and manages to sell all the Enerbars and Grainbars but only some Amazebars.
She makes a profit of £553.
How many Amazebars did she sell?