Star A is approximately 4.2 × 1013 kilometers away. Star B is approximately 6.3 × 1015 kilometers away. About how many times as far away is star B as star A?

You’re ordering more thread for blue jeans co. you usually purchase from ted’s threads, which sells 12 thread spools for $27. you recently received a notice from wade's wares that says you can buy thread from them for $2.30 each for the first 2 dozen and $2 a spool thereafter. you need to order 5 dozen spools. what percentage can you save by going with wade’s wares?