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CheckBookPrice(book:string) : string { switch (book) { case "English": msg = "English book price is $12."; break; case "Math": msg = "Math book price is $22."; break; case "Commerce": msg = "Commerce book price is $12."; break; case "History": msg = "History book price is $125."; break; case "Physics": msg = "Physics book price is $12.99."; break; default: msg = "Sorry, book out of stock"; } return msg; }