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Total money earned on Thursday is $1090.

Step-by-step explanation:

Let amount of money for one house call of Plumber A be x

So, amount of money for 2 house call of Plumber A=2 x

So, amount of money for 4 house call of Plumber A=4 x

So, amount of money for 3 house call of Plumber A=3 x

Let amount of money for one house call of Plumber B be y

So, amount of money for 8 house call of Plumber B=8 y

So, amount of money for 7 house call of Plumber B=7 y

So, amount of money for 9 house call of Plumber B=9 y

Let amount of money for one house call of Plumber C be z

So, amount of money for 8 house call of Plumber C=8 z

So, amount of money for 10 house call of Plumber C=10 z

So, amount of money for 9 house call of Plumber C=9 z

Now we are given that The total amount of money earned by all three plumbers on Monday was $1,400.

On Monday Plumber A has 2 calls , Plumber B has 8 calls and Plumber C has 8 calls

So, equation becomes:  --1

On Tuesday they earned a total of $1,660,On Tuesday Plumber A has 4 calls , Plumber B has 7 calls and Plumber C has 10 calls.

So, equation becomes: ---2

On Wednesday, they earned a total of $1,650.On Wednesday Plumber A has 3 calls , Plumber B has 9 calls and Plumber C has 9 calls.

So, equation becomes: ----3

Solving equation 1 ,2 AND 3

Equation 3:

                    ---4

Now substitute the value of x from 4 in 1 and 2

and

and

--- (a) and ---(b)

Now substitute the value of y from a in b

Substitute the value of z in (a)

Substitute the value of y and z in 1

So, amount of money for one house call of Plumber A = $100

So, amount of money for one house call of Plumber B =$80

So, amount of money for one house call of Plumber C =$70

On Thursday Plumber A made four house calls, Plumber B made six house calls, and Plumber C made three house calls.

So, equation becomes :

Substitute the values of x ,y and z

Thus total money earned on Thursday is $1090.

Hence Option C is correct.