Does the subject want to ask, "Mom brought 50 yuan to buy fruit and bought 3 boxes of blueberries. How much did each box cost?" ? 16 yuan a box. Mom brought 50 yuan money to buy fruit, and the principal was 50 yuan, and bought 3 boxes of blueberries at the price of 16 yuan. Currency is the product of commodity exchange, and the earliest currency at the end of primitive society is physical currency.