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The arithmetic difference between two percentage rates, rather than their relative percentage change.
To find the percentage-point change, subtract the old percentage from the new percentage. To find the relative percentage change, divide that difference by the old percentage and multiply by 100. The distinction matters most when the starting rate is small: a modest point change can look like a very large relative change.
Suppose an interest rate rises from 5% to 6%. It increases by 1 percentage point, or 100 basis points. Relative to the original 5%, the increase is 20%. On J$100,000 for one year, simple interest would increase from J$5,000 to J$6,000 under those hypothetical rates. Saying the rate rose by 1% would leave the intended calculation unclear.