Please let me know how to get answer for below question in easy manner using texas instrument ba 2 plus calculator

On June 30 of this year, a bank granted a corporation a $20 million 5-year term loan
with a floating rate of 200 basis points over Treasury Bill rates, payable quarterly. The
loan principal is to be repaid in equal quarterly installments over the term. If Treasury
Bills are expected to yield 6% for the rest of the year, how much will the corporation
pay to the bank in the last half of this year?

Quarterly interest rate: 8%4=2%\frac{8%}{4} = 2%48%=2% or 0.02.

Step 3: Input into the BA II Plus

** P/Y and C/Y: You can leave these settings as default or ensure they are set to 1 for this specific calculation since we’re manually calculating periods and rates.

I don’t think we could get the exact answer of 2,780,000 from the BA II plus calculator
but a closed answer of $2,446,268.73

I can tell you where your (incorrect) answer comes from:
i) The present value of 20 EQUAL payments of x discounted at 2% per period (AND COMPOUNDED EVERY PERIOD) is PV=x\sum_{n=1}^{20}1.02^{-n}=16.35143334x
ii) If you set the present value of that payment stream equal to 20, then 16.35143334x=20 or x=1.223134364
So each of your equal payments is 1.223134364
iii) Two of these payments would be 2x=2.446268728

I’ve just laid out what you calculated. It differs from the problem posed by the original poster.

@breadmaker showed you how to do the actual problem