Answer:
The artist sold 20 paintings
Explanation:
Total Amount Made = T = $1359
Amount made by selling 12 = A = (12)(75.5) = $906
Now, The remaining amount that she made is,
R = T - A = 1359 - 906 = 453
R = $453
And she makes these $453 by selling the discounted paintings,
The discount is 25% so the price becomes 75% of the original price,
so, The price of discounted paintings is,
P = (0.75)(75.5) = $56.625 per painting,
Hence, the number of these discounted ones is,
R = n(P)
n = R/P
n = 453/56.625
n = 8
In total then, she sold 12 + 8 = 20 paintings.