The average of runs of a cricket player of 10 innings was 34. How many runs must he make in his next innings so as to increase his average of runs by 4 ?
Choose the correct choice from the following options
A) 78
B) 79
C) 85
D) 87
E) 89

Rationale: "explanation : average = total runs / no . of innings = 34 so , total = average x no . of innings = 34 x 10 = 340 . now increase in avg = 4 runs . so , new avg = 34 + 4 = 38 runs total runs = new avg x new no . of innings = 38 x 11 = 418 runs made in the 11 th inning = 418 - 340 = 78 answer : a"
Answer: A