McGilla Golf has decided to sell a new line of golf clubs. The clubs will sell for $$800$ per set and have a variable cost of $$400$ per set. The company has spent $$150,000$ for a marketing study that determined the company will sell $54,000$ sets per year for seven years. The marketing study also determined that the company will lose sales of $9,500$ sets of its high$-$priced clubs. The high$-$priced clubs sell at $$1,100$ and have variable costs of $$700.$ The company will also increase sales of its cheap clubs by $11,000$ sets. The cheap clubs sell for $$440$ and have variable costs of $$230$ per set. The fixed costs each year will be $$9,100,000.$ The company has also spent $$1,110,000$ on research and development for the new clubs. The plant and equipment required will cost $$28,700,000$ and will be depreciated on a straight$-$line basis. The new clubs will also require an increase in net working capital of $$1,300,000$ that will be returned at the end of the project. The tax rate is $21$ percent, and the cost of capital is $10$ percent.

I am trying to calculate the payback period, NPV$,$ & IRR but every time I put the numbers in to calculate the answer is wrong please helpp.