#470 - added section on Pay Yourself First strategy

docs/budgeting/joint-accounts.md

@@ -73,7 +73,7 @@ what are your common expenses regarding groceries, utility bills, dining out, gi
 Both will then contribute their share of the joint expenses. This is called _planned income_.
 
 But how do you find your just share? The most just way to do this is by percentage of normal income per partner.
-If Bob makes € 4000 a month and Alice makes € 6000, the total income is € 10 000. Out of
+If Bob makes $ 4000 a month and Alice makes $ 6000, the total income is $ 10 000. Out of
 this, Bob will contribute 40% to the joint expenses. To compute the percentage for Bob: 400 (Bob's income) * 100 / 10000
 (total income). Alice's percentage is 60%, found by subtracting Bob's percentage from 100.