A crockery company makes china cups and saucers. How much clay would they need to buy if: - a cup uses 100g of clay - a saucer uses 150g of clay - it plans to make 450,000 cups and 280,000 saucers - there is no opening inventory - it would like to have closing inventories of 4,000kg of clay?

a)83,000kg

b)99,500kg

c)87,000kg

d)91,000kg