Help please!?

In order to test if crop production increases with application of the new fertilizer, 100 plots were selected at random with 50 of them having the same old fertilizer and the remaining 50 having the new fertilizer. It was found that with the usual fertilizer, 30 plots have more than 5 pounds of crop production and the rest have less than 5 pounds. And with the new fertilizer, the numbers are 40 and 10 respectively. What would be the expected frequency for the cell that corresponds to new fertilizer and more than 5 pounds production?

a.25

b.30

c.35

d.40

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