If I calculated correctly, I can save up to nearly 55%.
Put another way, my discount is less than or equal to almost 55%.
We need a new symbol for this, don’t we? A wavy less-than sign, perhaps?-The equivalent of ≈?
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Overthinking my teaching 
Do a Google Image Search for the word lesssim (three S’s).
Thanks R.
For the record
“Less than or equivalent to”? Huh. Well, there’s also the less popular symbol “lessapprox”.