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Number theory Difficulty 2.0 Junior Find the answer United Kingdom

Steven subtracts the units digit from the tens digit for each two-digit number. He then finds the sum of all his answers. What is the value of Steven's sum?

(A) $30$ (B) $45$ (C) $55$ (D) $90$ (E) $100$

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Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.