Mod just means you take the remainder after performing the division. Since 4 goes into 2 zero times, you end up with a remainder of 2.
Answer:
regular pay per hour =9.15
overtime pay per hour =13.725

This is what is in the middle of the second paragraph. That statement is correct.
I don't know that it is any simpler or not, but what they have done in the answer is rationalize the denominator. That means that the denominator is no longer under the square root sign.
To get that result, you multiply numerator and denominator by √F
When you do that, your get

This results in the middle answer.

Answer:
add 6
Step-by-step explanation:
Answer:
6400 AED
9.14%
yes. The interest rate is 9.14%. This is less than 10%
Step-by-step explanation:
Interest amount she would pay = total of loan to be repaid - amount borrowed
16,400 - 10,000 = 6,400 AED
Interest = loan x interest rate x time
we have all the parameters of the above equation apart from the interest rate. We can thus determine the interest rate from the above equation
6,400 AED = 10,000 x interest rate x 7
6,400 AED = 70,000 x interest rate
Divide both sides by 70,000 to find a value for interest rate
interest rate = 0.091429 = 9.14%