The fruit shop sells 21 kilograms of apples in the morning and 23 kilograms in the afternoon, and the apples are sold for B yuan per kilogram. How much is the total price for that day?
水果店上午卖出苹果21千克，下午卖出苹果23千克，每千克苹果B元，这天共卖了多少元钱．
<result>44</result>