See that messy ugly fraction on the right side of the equation ? Let's make it easier to write.
If we multiply the top and bottom of the fraction by the same thing, we won't change the value of the fraction. Let's multiply top and bottom by <em>R</em> .
The fraction 1 / (1/R + 1/2R)
Multiply top and bottom by R :
The fraction = R / (1 + 1/2) .
But that's just R/1.5 .
So 20 = R/1.5
Multiply each side of this equation by 1.5 , and you have . . .
<em>30 = R</em>
<em></em>
This is not even a problem about electrical circuits or resistors. This is a problem about handling complicated fractions to make them less messy.
To find the highest common factor (HCF) between two numbers , first to take HCF of both the numbers.

- Take every common prime factor between 12 and 40

- Finally, identify the factors common to each number and multiply those common factors together.


<h2><u>Quick answer</u> :</h2>

<h2><u>Answer with steps</u> :</h2>
Money Dayami earns for an hour's work = $10.50
Number of hours Dayami worked last week = 40
Money Dayami would have gotten for her work :


Thus, money earned by Dayami for her work = $420
Total sales Dayami made last week = $2050
Money Dayami must have earned as commission :
= 6% of total sales




Thus, money Dayami earned as a commission = $150
Dayami's weekly gross salary last week :


Thus, total salary = $570
Therefore, Dayami's gross salary last week =<u> $570</u>