Students from Guangming Primary School donated to the disaster area. The fourth grade donated a total of 864.8 yuan, 107.6 yuan less than the fifth grade. How much is the total donation for the fourth and fifth grades?
光明小学的同学为灾区捐款，四年级共捐864.8元，比五年级少107.6元．四、五年级共捐款多少元？
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