only if she invested in 5 and each one fell by 10% would it give 50%, but if something falls by 50% to rise to what it was before it would have to rise much more, at least 100%

Hey, can someone help explain this to my sister? I’m so tired of repeating it.

She put $2,000 into crypto. Then the market drops 10%, so her portfolio is down to $1000. Next, the market goes up 15% — but instead of going back over $2,000, she only gets $1750.

Even though the coins are priced higher than the dip, her total money is still less than before. She doesn’t get why this happens and feels like she’s being scammed, but she’s not.

Can someone break down why this happens in a simple way she can understand?