To find the percent of their goal that has been reached, we need to calculate the ratio of the amount they have earned to the total amount they want to earn, and then multiply by 100 to convert to a percentage:
percent of goal reached = (amount earned / total amount)*100
The amount they have earned is $830, and the total amount they want to earn is $2050. Plugging these values into the formula, we get:
percent of goal reached = (830 / 2050)*100 = 40.4878...%
Rounding this to the nearest tenth, we get:
percent of goal reached ≈ 40.5%
Therefore, the answer is A. 40.5%.