Hello!
We are given the exchange rate for $4:
4 dollars = 8 pa’anga
We are now asked to find the exchange rate for $12. We’ll begin by calculating the number of times $4 will go into $12:
12 ÷ 4 = 3
We have now proven that $4 goes into $12 a total of 3 times. Now simply multiply the known exchange rate of $4 by 3:
(8 pa’anga) × 3 = 24 pa’anga
We have now proven that $12 would return 24 pa’anga.
I hope this helps!