At the beginning of the year, a manufacturer’s work in progress was worth $\$850$. By the end of the year, it had risen to $\$10\,200$. How did this rise affect the cost of production and the cost of sales?
- Acost of production: decrease; cost of sales: decrease
- Bcost of production: decrease; cost of sales: increase
- Ccost of production: increase; cost of sales: decrease
- Dcost of production: increase; cost of sales: increase