Three representatives from each employee type (faculty, staff, administrators) are chosen for a salary committee.

Ohn has paid $5730 in first 20 installments

Step-by-step explanation:

As per the question Ohn payed the first installment =$100

Next month Ohn payed the installment = 1.1×$100

Similarly subsequent installment =1.1×1.1×$100

So we can write first 20 installments as

⇒100+100×1.1+100×1.1²+100×1.1³.........+100×

And we know in geometric series

1+x²+x³+........... = (1-)÷(1-x)

Therefore sum of first 20 installments will be

⇒100(1+1.1²+1.1³............ =(1- )÷(1-1.1)

= 100(1-6.73)÷(-.1)

=100×5.73÷.1

= $5730

So Ohn has paid $5730