What should come in place of the question mark (?) in the following question?
​$$27\frac{1}{2} + 15\frac{3}{4} - 12\frac{3}{5} + 18\frac{4}{5} = ?$$​​

Correct option is A

Given:
​$$27\frac{1}{2} + 15\frac{3}{4} - 12\frac{2}{5} + 18\frac{4}{5}$$​​
Solution:
​$$27\frac{1}{2} + 15\frac{3}{4} - 12\frac{2}{5} + 18\frac{4}{5}\\\ \\= \frac{55}{2} + \frac{63}{4} - \frac{62}{5} + \frac{94}{5}\\\ \\\\\ \\= \frac{550 + 315 - 248 + 376}{20}\\\ \\= \frac{993}{20}\\\ \\ = 49\frac{13}{20}\\$$​​