Given,

40.005% of 439.998 +?% of 655.011 = 228.5

It can be approximated as

40% of 440 +?% of 650 = 230

= $\frac{40\times 400}{100}+?\% of 650=230$

= 176+?% of 650 =230

= ?% of 650 =230-176

= ? =$\frac{54\times 100}{650}=\frac{5400}{650}$

= 8.30 ≈ 8

Hence, Option A is correct.