Hello, Chris!

The question is not clear . . .

I'll take a guess . . .I need help to make 0.85p into 0.31p and have the percentage shown,

so that 85p turns into 31p automatically.

What would be the best way to achieve this on a calculator?

To change 0.85 into 0.31, we willmultiplyby some percent.

Let = the percent.

Then we have: .

It follows that: .

Therefore: .

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Check

. . . close enough!