Principal — Principal amount borrowed. Larger amount increases periodic payments and total interest; compare to down payment. Example: 0.1.

Principal is required

Rate — Rate as a percentage. Determines how quickly interest or growth accrues; even 0.5% changes matter over time. Example: 0.1.

Rate is required

Days — Financial input. Directly drives affordability, yield, or cost; small changes compound over time. Example: 0.1.

Days is required