Sarita, Mamta and Rashmi can knit a sweater in 15, 12 and 20 days respectively. Doing that work together they get an amount of Rs. 8400. What is the share of Mamta in that amount?

Sarita, Mamta and Rashmi can knit a sweater in 15, 12 and 20 days respectively. Doing that work together they get an amount of Rs. 8400. What is the share of Mamta in that amount?
1). Rs. 2520
2). Rs. 3350
3). Rs. 3400
4). Rs. 3500

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