Factoring is a method of raising _____ finance through account receivable credit offered by commercial banks and factors.

Exchange rates state the value of one currency in terms of other currencies. Which one of the following statements with respect to the exchange rate of the currency is correct? 

If $\mathrm{A}=\left\{x/x\le 10, x\in \mathrm{N}\right\}$ and $\mathrm{B}=\left\{x/x\le 10, x\in \mathrm{W}\right\}$, then $\mathrm{A}\cap \mathrm{B}=?$