Question

Roby buys 5 red wallpapers for $\$$49 each and 3 blue wallpapers for $\$$83 each. Estimate the difference between the total amount spent on red and blue wallpaper.
Hint: Round off each item's price to the nearest tens.

• A. $\$$40
• B. $\$$30
• C. $\$$20
• D. $\$$10

Answer 1

The correct option is D $\$$10

49 can be rounded off to 50 and 83 can be rounded off to 80.
Amount spent on red wallpapers
= Number of red wallpapers x Cost of each red wallpaper
i.e.

Amount spent on blue wallpapers
= Number of blue wallpapers x Cost of each blue wallpaper
i.e.

$\text{Difference =}\$250-\$240=\$10$