(140 / 180) * 100 = 77.78%
Typically, the grading scale may vary depending on the educational system or institution. However, based on a common grading scale, a score of 77.78% usually falls within the B+ or B range.
It's important to note that different institutions or grading systems may have slight variations in their grading scales, so it's always best to refer to the specific grading guidelines provided by your instructor or institution.