Answer:
Step-by-step explanation:
Let the cost of the canvas be $x per square inch.
The size of the canvas the artist is purchasing is
24 × 36 inches.
Calculating the area of the canvas gives us 24 × 36 = 864 square inches.
Thus, the cost of the canvas will be 864x.
The new price of the canvas after the increase is x + 5% of x.
That simplifies to x + 0.05x = 1.05x.
Calculating the new cost of the canvas results in 907.20x.
The price increase is 907.20x - 864x, which equals 43.2x.
Calculating percentage: 
= 5%.
Therefore, the artist will save 5% on the cost by purchasing the canvas today.