Debt/GDP = 0,36 (36%)
Accumulated deficit for last 5 years/budget income for last 5 years = -0,085 (surplus) 
Years since last default = 23 (1989)
5-year inflation = 0,36 (36%)
Budget expences/GDP = 0,43
Trade deficit/GDP = - 0,062 (surplus)
World GDP per capita/Country GDP per capita = 4
Political factor = 0,3
Crisis factor = 0,2 (Drug wars at neigbour countries)
Other unique factors = 2 (On the edge of civil war)

OVERALL CREDIT SCORE: 0,651 (65,1%). This responds to B.

Calculated with this (new) formula:

r = 10/{[1+(debt/GDP)] + [1+10*(accumulated deficit for last 5 years/budget income for last 5 years)] + [1 + (10/years since last default)] + [1+3*(accumulated of last 5 years inflation)] + [1+(budget expences/GDP)] + [1+ 10* (trade deficit/GDP)] + [world's GDP per capita/country's GDP per capita] + [1+political factor] + [1+crisis factor] + [Other unique factors]}