Many stores use a psychological pricing strategy called odd pricing, ..... prices end in odd numbers, such as $19.95

English as a Second Language English Vocabulary, Grammar and Idioms
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Many stores use a psychological pricing strategy called odd pricing, ..... prices end in odd numbers, such as $19.95. (*) whenever (*) whereby (*) while (*) whither

This is a companion discussion topic for the original entry at https://english.best/questions/7239,many-stores-use-a-psychological-pricing-strategy-called-odd-pricing-___-prices-end-in-odd-numbers-such-as-1995/
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I believe it`s “whenever” bacause it makes sense. Thanks.

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You need ‘whereby’ here because it describes how odd pricing works in detail.

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Thank you. You weere very helpful.

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