Multiply 5436 and 9999 and find the sum of last five digits of the result.

The correct option is B 24
Step1: Subtract 1 from 5436 and write on the left hand side.

Step2: Subtract 5436 from 9999, we get 9999 – 5435 = 4564. Write it on the right side of 5435.

Thus, 5436 $\times$ 9999 = 54354564.
Hence, sum of last five digits = 4 + 6 + 5 + 4 + 5 = 24