Keikai formats a number differently from Excel

Steps to Reproduce

1. load the attached file
2. check C1

Current Result

7.9

Expected Result

8.0, the same as Excel

Debug Information

1. All formulas are the same but different formats specified. column C format: 0.0, column B format: 0.00
2. all AVERAGE results in column B are 7.95, in column C, they should be 8.0
3. cell values in A1:A5 are different in Keikai and Excel after show more decimal places:
keikai:

Excel:

Root cause

In Excel file, A1:A4 are:

8.3999999999999986
8.0999999999999979
7.799999999999998
7.4999999999999982

            <c r="A1">
                <v>8.3999999999999986</v>
            </c>

But Excel just shows them as

8.40000000000
8.10000000000

7.80000000000
7.50000000000

Keikai's calculated result is 7.9499999, so if set to 1 decimal place, it's 7.9 instead of 8.0
Excel's calculated result is 7.95, so with 1 decimal place, it's 8.0