A premium finance agreement may provide for the payment by the insured of a delinquency charge per installment of at least $1.00 but which may not exceed a maximum charge of 5% of the delinquent installment or $5.00, whichever is less, for each installment which is in default for a period of 10 days or more. Further, if the default results in the cancellation of any insurance contract listed in the agreement, the agreement may provide for the payment by the insured of a cancellation charge equal to the difference between any delinquency charge imposed in respect to the installment in default as permitted hereinabove and the sum of $5.00.