i need help with this problem

A juice manufacturer received 1000 boxes of oranges from its supplier, and the manufact turer pays 50 cents/lb to the supplier. To estimate the total weight of the oranges, the manufacturer decides to use a 1-in-20 systematic sampling. It is reasonable to assume that the the boxes are packed and stored in a random way. Here is some information about the sample: . sample mean: 7 = 24.54. . sample standard deviation: s = 1.43 1. Estimate the total weight of these 1000 boxes of oranges and place a bound on the error of estimation. 2. How much should the manufacturer pay the supplier