Question

practice

1. a laptop costs $800. it is discounted by 15%, then a warranty fee of $60 is added.

a. find the discounted price.
b. find the final cost.

1. in a class, the ratio of boys to girls is 3:5. if there are 24 boys, how many girls are there?

Explanation:

Step1: Calculate discount amount

$\text{Discount} = 800 \times 0.15 = 120$

Step2: Find discounted price

$\text{Discounted Price} = 800 - 120 = 680$

Step3: Calculate final cost

$\text{Final Cost} = 680 + 60 = 740$

Step4: Find ratio unit value

$\text{Unit Value} = \frac{24}{3} = 8$

Step5: Calculate number of girls

$\text{Number of Girls} = 8 \times 5 = 40$

Answer:

3a. $\$680$
3b. $\$740$

1. 40