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in Ibm English assessment test means what they may ask?? if any one recently attended plz

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Four different electronic divices make a beep after every 30 min., 1 hr, 1½ hr. and 1hr 45min. respectively All the diveices beeped together at 12 noon. They will again beep together at the cost price of 30 items is equal to the sale price of 40 items .What is percentage profit?