Round to Next .05 in C

Question

Consider a float value like 1.82 set by the user. How do I find the next highest .05 value? For the given example the next highest value is 1.85.

Is the

Answer 1

float fixedCeil(float num, float factor)
{
  float steps = 1.0f / factor;
  return ceil(steps*num)/steps;
}

assert(fixedCeil(2.43f, 0.05f) == 2.45f);

(assert is just fictional)