9. Piyush's marks in Mathematics were wrongly read as 65 instead of 85

1.	9. Piyush's marks in Mathematics were wrongly read as 65 instead of 85. What is the percentage error inthe marks?
Answer» $\rule{400}4$ ☆ ANSWER:- ▪︎ Given:- Piyush's MARKS read wrongly as 65. Correct marks he had got = 85. ▪︎ To FIND:- The percentage of error. $\rule{400}2$ ▪︎ So, Firstly, • Before finding the percentage of error LET us first find out the error of marks he had got:- $\sf = 85 - 65 \\ \\ \sf = <klux>20</klux>$ ▪︎ So he *had* *got* an *error* of 20 *marks. $\rule{400}2$ ▪︎ Therefore, • Percentage Of Error, $= \sf\frac{20}{85} \times 100 \\ \\ \sf = \frac{2000}{85} \\ \\\sf = 23.52 \: percent \: (approx)$ $\therefore$ The* error is of 23.52 or 23.5 percent. $\rule{400}4$