Oh, and @Melody there's a general gold standard that is used through the world, and the price of it is tracked.
And since I apparently can't edit my older post, all currency values are in US Dollars (USD). If you wanted to find the value in other currencies, simply convert the final value ($878,144.38 USD) from USD into whatever your preferred currency is.
Consider it like this:
You have a square, and all sides are 10 units long. The area, therefore, would be 10*10 = 100 square units.
You take the sides of the square and increase them by 10% (or 110% of the original). Take 10% of 10 (=1) and then add it back into the original. You now have a square with all sides 11 units long. This square now has an area of 11*11 = 121 square units.
At this point, you can see that the square increases from the original 21 units. That is another 21% added on, and that is your final answer: A 21% increase.
If you want total coins, then:
146 + 812 = 958 coins
However, if you want total value...
If we consider all gold and silver coins to be roughly an ounce, then we have 146 ounces of silver and 812 ounces of gold. By today's standards, gold is worth $1078.90g (g = ounces of gold) and silver is worth $14.23s (s = ounces of silver). Simply plug in the numbers and then add it all up.
Gold: $1078.90*812 = $876066.80
Silver: $14.23*146 = $2077.58
$876066.80 + $2077.58 = $878144.38
Zoe has $878,144.38 in precious metals. In other words, she's freaking loaded and can retire happily as long as she invests wisely in the correct companies. Poor usage of her money will lead to her being penniless in a matter of weeks and she will be homeless and lamenting her fate.
EDIT: I've just realized this is my 250th answer. Oh joy.
Doing well enough @CPhill, been busy with school. Junior year of high school, still working on getting into a good college sometime in a couple of years for music performance, etc. You?
EDIT: Thanks for the link. For the first part at least, Example 3 from the link seems to be almost the same thing, just with different numbers. I'll try that first to see if that doesn't help at all ^^