Relief Inc. manufactures portable toilets for use on construction sites. Each toilet requires 40 kilograms of plastic and plastic is estimated to cost $5 per kilogram. At the beginning of June, the company had no plastic inventory on hand. During the month, the company purchased 4,500 kilograms of plastic for $24,000. The company produced 100 toilets during the month and had 300 kilograms of plastic on hand at the end of the month. Required: Compute the company's direct materials price and quantity variances.