Anthropology homework help

It is hot day, and Bert is thirsty. Here is the value he places on each bottle of water:Value of first bottle          $7        Value of second bottle    $5Value of third bottle         $3Value of fourth bottle      $1a. From this imformation, deerive Bert’s demand schedule. Graph his demand curve for bottle water.b. If the price of a bottle of water is $4 how many bottles does Bert by? How much consumer surplus doesBert get from his purchase? Show Bert’s consumer surplus in a graph.c. If the price falls to $2, how does quanity demand change? How does Bert’s consumer surplus change?How does Bert’s consumer surplus change? Show these changes in a graph.