Suppose m is the required multiplier.Then multiplication by m would increase any x by 11,
that is, x * m = x + 11 for all x
x * m - x = 11
x*(m - 1) = 11
m - 1 = 11/x
m = 1 + 11/x
But that means that m is not defined for x = 0 and there is a different m for every non-zero x.
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To decrease a number by 3.9 percent, multiply it by 0.961
1.028
11/16 = 0.6875 as a decimal
.11
You would write 11 cents as $0.11 or $.11 in decimal form.