Mary bought [[$ 2 $]] kg of apples and [[$ 3 $]] kg of grapes from the store. The purchases totaled [[$ 12.30 $]] QAR. The next day, the price of apples was increased by [[$ 10 \: \% $]] and the price of grapes was reduced by [[$ $ 0.20 $]] per kilo. The purchase would then have cost a total of [[$ 12.12]]] QAR. What were the prices per kilogram of apples and grapes at the time of purchase?



Answer: The price for apples was QAR/kg and for the grapes QAR/kg.