May one lend money to a gentile on Chol Hamoed?[1]

One may make an interest loan to a gentile customer on Chol Hamoed if the gentile is a previous customer. If the gentile is a new customer, then although it is permitted to give him an interest loan nevertheless he is to use some of the interest earned towards expenditure on Simchas Yom Tov. 

[1] 539:13