A 9-row seed drill with 20 cm row spacing delivers4.25 g per roller per shaft revolution. The shaft turns once per two ground-wheel turns. Ground-wheel rolling diameter .35 m, no skid, and π=3.14. Find seed rate in kg/ha.
One shaft revolution deposits $9(4.25)=38.25$ g. It covers distance $2\pi D=2(3.14)(.35)=2.198$ m with effective width $9(.20)=1.8$ m, area 3.9564 m². Seed rate is $(.03825/3.9564)(10000)=96.62875$ kg/ha. The intended rounded option is **96.62,A**; minor truncation accounts for the last digit.
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