Final answer:
The manufacturer sold 0.4 calls per month, and over two months, this amounts to 0.8 calls total (0.4 calls × 2 months). Option a) 0.8 calls is the correct answer.
Step-by-step explanation:
The question presents a scenario where BIRDS, a bird call manufacturer, sold 0.4 calls in two months. To find out how many calls were sold in those two months, we simply need to multiply the monthly sales figure by the number of months. The calculation is 0.4 calls per month × 2 months, which equals 0.8 calls. So the correct answer is: a) 0.8 calls.