To find the percent decrease in the amount collected, we need to calculate the difference between the two amounts (last year's and this year's), divide it by the original amount, and then multiply by 100 to get the percentage.
The difference between the amounts collected is:
$3,470 - $347 = $3,123
The original amount is $3,470.
So the percent decrease is:
($3,123/$3,470) x 100% = 90%
Therefore, the percent decrease in the amount collected is 90%.