求助‌‌‍‍‌‍‍‌‍‌‌‍‌‍‍‍‌‍‍‌‍‍‌‍‍‌‌‍‌‍‍‌一道数学题

a safe contains 2 bags of coins and 4 bags of paper money.The total value of the money in the 6 bags is 1200$.

Quantity A(The total value of the money in the bags that contain coins )

Quantity B($401)

选项：

A： Quantity A is greater

B: Quantity B is greater

C: The 2 quantities are equal

D: The relationship cannot be determined from the information given.

答案给的是B，为什么不是D呢，怎么确定的Quantity B更大？