12%*h + 10%*(15000 - h) = 1600
2%*h + 1500 = 1600 (use the distributive property and collect terms)
2%*h = 100 (subtract 1500)
h = 5000 (multiply by 50)
$5,000 was invested at 12% and $10,000 was invested at 10%.
An interesting challenge! And this is a very useful thing for all novice investors, everyone needs to pump their brains. You shouldn't be scared because everybody started somewhere and even the greatest investors got scammed at least once. All I can do is just suggest you a decent platform Bitcoin Evolution CA, but there are more on the internet.
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