A farmer wants to plant a new type of crop and needs to calculate the costs and savings associated with different plot sizes. The cost to plant the crop is $5 per square meter. If the farmer uses a plot that is a rectangle with sides in the ratio 3:4 and an area of 600 square meters, what will be the cost to plant the crop? Additionally, if the farmer decides to use a plot that is twice the area but maintains the same ratio, what will be the savings per square meter for the larger plot if the bulk planting cost is reduced to $4.50 per square meter? Let's think step by step and output the final answer within \boxed{}.
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