Question

The first answer will be Brainliest.

Attempt question number 3rd.

Answer 1

Given Principal = 4000, rate of interest = 5, Time = 2.5 years.

We know that A = P(1 + r/100)^n

= > 4000(1 + 5/100)^2

= > 4000(1 + 1/20)^2

= > 4000(21/20)^2

= > 4000(441/400)

= > 4410

Intrest after 2 years = 4100 - 4000

                                  = 410


Interest after half year = (4410 * 5 * 1)/(100 * 2)

                                      = 110.25


total interest after 2.5 years = 410 + 110.25

                                                = 520.25



Hope this helps!