Final answer:
Kayla initially overestimated the total cost by $0.05 by rounding up $34.95 to $35. The exact cost of the two sweaters is $55.70, which is the sum of $20.75 and $34.95.
Step-by-step explanation:
Kayla wants to know if she can afford the two sweaters priced at $20.75 and $34.95. To find out, we need to calculate the exact sum of the two prices. Kayla mentally added $20.75 to $35 (rounding up $34.95 to $35 for easier calculation) and got the approximate sum of $55.75. Since Kayla rounded up $34.95 to $35, she overestimated by $0.05. To get the exact total, we need to subtract $0.05 from the approximate total. Therefore, the exact sum would be $55.75 - $0.05, which is $55.70.