A salesman gets a basic wage of £160 per week plus a commision of 30% of the sales he makes that week.
In one week his total wage was £640
Work out the value of the sales he made that week.

The value of the sales that week was £1,600

Step-by-step explanation:

The wage of a salesman is made of two parts: A fixed-wage of £160 per week plus a commission of 30%  (0.3) of the sales he makes that week.

The wage can be modeled by the function:

W = 160 + 0.3x

Where x is the amount of sales per week.

If he had a total wage of £640, then we can find the values of the sales by solving for x the equation

160 + 0.3x = 640

Subtracting 160:

0.3x = 640 - 160

0.3x = 480

Dividing by 0.3:

x = 480/0.3

x = 1,600

The value of the sales that week was £1,600

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