There are 200 bolts in each box of bolts. Samira buys $$\(c\)$$ boxes of bolts. Samira uses the bolts she bought to fill packets of bolts. There are 50 bolts in each packet of bolts. Samira sells $$\(d\)$$ packets of bolts. The total number of bolts Samira has left is $$\(T\)$$ (b) Write down a formula for $$\(T\)$$ in terms of $$\(c\)$$ and $$\(d\)$$ (3)

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