When Sungmo solved and scored the math problems, he got 1/5 of the questions wrong. How many times the number of questions answered correctly is the total number of questions?
1 1/5 [OP_SUB]
var_a = 1
var_b = 0.2
var_c = var_a - var_b
print('{:.2f}'.format(round(var_c+1e-10,2)))