Tagged finance

Split an amount into the part used and the part unused over a billing period, losing nothing.

Compound interest accrued period by period in minor units, the way a statement is built.

Selling price from a cost and a target margin or markup in basis points, with explicit rounding.

Reducing-balance depreciation schedule at a fixed rate, writing off to the residual value in the final year.

Straight-line depreciation schedule whose charges sum exactly to cost less residual value.

Profit on a sale with both the margin and the markup, so the two are never confused.