in what time will rs 4000 lent at 3 percent per annum on simple interest earn as much interest at 5000 will earn in 5 years at 4 percent at 4 percent per annum on simple interest ​

It takes 16.67 years

Step-by-step explanation:

Find time taken for P = 4000 to be same as Amount₁ .

That is Amount₂ = Amount₁ = 6000

an = 22 + (n-1) *6

110 seats

step-by-step explanation:

an=a1+(n-1)(d)

a1 = 22   this is the first item in the sequence

d =6   this is how the sequence goes up

a)   an = 22 + (n-1) *6

b) a12 = 22 + (12-1) *6

    a12 = 22+11*6

  a12 = 22 +88

  a12 = 110