A grocery store uses 600 boxes of plastic bags per month. The boxes cost $25 each, placing an order for plastic bags costs $20, and holding costs are $5 per box per month.

Assume the store orders boxes in smaller quantities than the economic order quantity. This will ______ holding costs and ______ ordering costs.

a) decrease;increase

b) decrease;decrease

c) increase;decrease

d) increase;increase

e) none of above