Let's break this down step by step:
1. **Wood Cost Increase**: Gordon's wood costs 30% more than he had estimated. Let "x" be his original estimate for the wood cost.
The increased cost for wood = 0.30 * x = 0.3x
2. **Material Requirement Increase**: Gordon needs 40% more material than he had estimated. Let "y" be his original estimate for the material requirement.
The increased material requirement = 0.40 * y = 0.4y
3. **Cost Increase Due to Material Requirement**: The cost of the wardrobe is directly proportional to the material used. So, the cost increase due to the material requirement is also 40% more than his original estimate for the material cost.
Increased cost due to material requirement = 0.40 * x
Now, to find out how much more than his original estimate the material for the wardrobe costs, you need to add the cost increases due to both the wood and material requirement:
Total cost increase = Increased cost for wood + Increased cost due to material requirement
Total cost increase = 0.3x + 0.4x
Total cost increase = 0.7x
So, the material for the wardrobe costs 70% (0.7x) more than his original estimate.