Aspring stretches out by 8cm when a 0.2 kg weight is placed on it. how much does the spring stretch by when a 0.5 kg weight is placed on it?

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.