Below is an instruction that describes a task. Write a response that appropriately completes the request in Chinese. Please answer in Chinese.

### Instruction:
 玛丽亚的存钱罐里有4个一角硬币，4个二角五分硬币和7个五分硬币。她妈妈给了她5个二角五分硬币。现在玛丽亚有多少美元？


### Response:
 玛丽亚的存钱罐里有4 + 5 = <<4+5=9>>9个二角五分硬币。
二角五分硬币的美元数量是9 * 0.25 = $<<9*0.25=2.25>>2.25。
一角硬币的美元数量是4 * 0.10 = $<<4*0.10=0.40>>0.40。
五分硬币的美元数量是7 * 0.05 = $<<7*0.05=0.35>>0.35。
总美元数量是$2.25 + $0.40 + $0.35 = $3 <<2.25+0.4+0.35=3>>3。