Answer:
If the price of gold decreases at a monthly rate of 3.9%, we can calculate the decrease over the span of a year by multiplying the monthly decrease by 12 (months in a year).
3.9% * 12 = 46.8%
3.9% * 12 = 46.8%Therefore, the price of gold will decrease by approximately 46.8% over the span of a year.