I didn't understand this section, why would they pay $73 for $75 and where do the $25 come from?

"Investor Economics: Assume a $100 BNPL loan. $25 is paid upfront by the Consumer, so an Investor pays $73 for a $75 loan, discounted for risk, fees, and return expectations. The Investor receives $75 from customer repayments over 6 weeks minus servicing fees of $0.25. A $1.75 profit on $73 investment over 6 weeks is a 2.4% return, or 22.8% annualized (52 weeks/6 weeks = 8.67 periods each year; annualized return = (1+0.024)8.67 - 1)."