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The initial population of catfish is .

The number of catfish increases by per month.

(a)

The previous month population  is increases and multiplied by to the next month population .

Hence,

.

The farmer harvests catfish per month.

Therefore, the catfish population after months is .

(b) Find the number of catfish in the pond after six months.

The catfish population after months is .

The initial population is .

The population after one month is .

.

.

.

.

.

The catfish population in the pond after six months is  .

(a) The catfish population after months is .

(b) The catfish population in the pond after six months is  .