Consider the following relations: product (pid, pname, price, makercid) purchase (buyerId, pid) company (cid, cname, country) person (ID, name, phone) Write the following queries in relational algebra: a) Find the buyerID of people who did not purchase any product with a price greater than 200. b) Find the pid of those product that are made in USA or were purchased by Tom Smith. Consider the following relations: product (pid, pname, price, makercid) purchase (buyerId, pid) company (cid, cname, country) person (ID, name, phone) Write the following queries in relational algebra: a) Find the buyerID of people who did not purchase any product with a price greater than 200. b) Find the pid of those product that are made in USA or were purchased by Tom Smith