134.6 us dollars
step-by-step explanation:
1 us dollar = 1.33 canadian dollars
so, 150 us dollars = 150 × 1.33 = $199.5.
in canada, the money mitchell spent = 20 canadian dollars.
remaining canadian dollars with him = 199.5 - 20 = 179.5.
after mitchell returned to us, he exchanged the remaining canadian dollars to us dollars.
179.5 canadian dollars = 179.5 × 0.75 = 134.6 us dollars.