I don’t really know why I do it, but I collect 5¢ coins. I have a big jar and every now and then I empty out whatever 5¢ coins I have in my purse and put them in the jar. I decided recently that I’m going to take it to the bank at my birthday. I wanted to have an idea of how much money I had in the jar. According to the Royal Australian Mint, each coin weighs 2.83g. According to my scales, I have about 2.21kg of coins. So:

2210 ÷ 2.83 = 780.92 Let’s round that off to say I have 780 coins.
780 x 5¢ = $39.00

Thirty-nine bucks! Not bad! What shall I buy??