CA Foundation calculator tricks

An overdraft of Rs. 50.000 to be paid back in equal annual installments over a period of 20 years. Find the value of Installment, if interest is compounded annually at 14% per annum.

A question from ICAI MTP May 2020

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[niranjanaramachandran]

Sir even i hav the same calculator
I pressed 2*= and got 4
Then when i again press the = button its not working!!
What to do sir?