Yes, this IS an acceptable level but watch out, it may be Dollars in & pesos out!! Normal rates for Dollars in AND out are around 7 or 8%. Commercial rates through "safe" finance houses are about 18% p.a. or 1.5% paid monthly. This 1.5% monthly interest may be left in to compound if you so desire.
Interest rates from the banks are going down now though, businesses in this country have been complaining bitterly that rates of borrowing are too high & the govrnment has bowed to this pressure (via the Central Bank) & is beginning to reduce the bank rates. What is 8% now, may be 6% in a couple of months. The finance houses will enter a contract for a 12 month 'fixed' rate if you want them to.
Get back to me on my e-mail address if you want more information. We ahve been investing with these commercial institutions for about 4 years & have had no problems with their integrity & service. Grahame ^_^