To calculate the amount of paste needed for deworming a 1320-pound steer:
1. Calculate the number of 220-pound intervals:
1320 pounds / 220 pounds = 6 intervals
2. Multiply the number of intervals by the dose rate:
6 intervals * 5 grams/interval = 30 grams
So, 30 grams of paste should be used to deworm the steer.