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Find the cost per pen by dividing:

300/10 = 30

It costs rs 30 for one pen

1 dozen = 12

2 dozens = 24

Multiply the values:

24 x 30 = 720

The cost of 2 dozen pens is rs 720

However, as it is asking for 'how much more' you have to subtract:

720 - 300 = 420

The cost is rs 420 more

Hope This Helps You!

Good Luck (:

Have A Great Day ^-^

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