Question 1
Linh buys a box of marbles consisting of: 4 red marbles, 6 blue marbles, and 10 yellow marbles. Each red marble costs 500 VND, each blue marble costs 200 VND, each yellow marble costs 100 VND. How much more or less is the total cost of the red marbles compared to the total cost of the blue marbles?
The supplied key prints correct-answer weights of 4 and 6 points. Wrong-answer and blank-answer scoring are not stated; no penalties or blank credit are inferred.

The supplied key prints correct-answer weights of 4 and 6 points. Wrong-answer and blank-answer scoring are not stated; no penalties or blank credit are inferred.
