Given,

63.5% of 8924.2 + ?% of 5324.4 = 6827.5862

It can also be approximated as

64% of 8924.2+?% of 5324.4=6850

= 89×64+?×$\frac{5300}{100}$=6850

= 90×64+?×53=6850

= 5760+?×53=6850

= 6850-5760=?×53

= 1090=?×53

=$\frac{1100}{53}$

= 20.75 ≈ 22

Hence, Option B is correct.