A$-$Maize$-$ing Farms grows a special type of organic corn in their $450\text{'}$ X $950\text{'}$ field $(427,500$ sq$.).$ They then sell the crop to local retailers. Two planting seasons, the farm was able to harvest and sell $32,500$ pounds of corn. Last summer, by utilizing a new fertilizer, the product promised a $25\%$ increase in yield. The farm harvested $37,750$ pounds of corn

a$.$ What was the farm's productivity two summer ago?

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b$.$ What was their productivity last summer?

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c$.$ What was the change in productivity?

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d$.$ Did the fertilizer live up to its promise?