In what ratio tea at Rs 240/kg should be mixed with tea at R

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In what ratio tea at Rs 240/kg should be mixed with tea at Rs 280/kg so that on selling the mixture at Rs 324/kg there is a profit of 20%?

[2017 SSC CGL 12 AUG Shift 3]

A 1 : 1

B 1 : 2

C 1 : 3

D 1 : 4