Provide a step by step solution for the following math problem: A shopping center sells T-shirts at $8 each, a sweater at $18,  and a jacket at $80. The jacket is on sale with a 10% discount. The sales tax is 5%.  Kevin wants to buy six T-shirts, four sweaters, and five jackets for his children. How much does Kevin have to pay for all the items, including the sales tax?