Multiply 4 by 1/3.
4 × 1/3 ⇒

×

4/3 = 1.3333333...
1.33333 ⇒ 1 1/3
The robots will be doing 1 1/3 of the work.
Answer:
I can help what is your question
For this case we have a function of the form:

Where,
A: initial population
b: growth rate
x: number of years.
We then have the following function:

For x = 4 years we have:
Answer:
the formula for exponential growth is:
y = 210000 * (1,125) ^ x
The population of Canyon Edge after 4 years is:
y = 336379