javascriptLogic errorMedium

Math formula returning negative results

Time: 0:00

What it should do

percentChange(oldValue, newValue) should report the change as a percentage of the old value. Going from 100 to 150 is +50.

What goes wrong

percentChange(100, 150) returns -50 instead of 50 — a rise is reported as a fall.

Hints

This is a logic errors bug

The wrong operator, an inverted condition, a formula the right way round but backwards.