Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §2.5 The Product and Quotient and Power Rules, #40 · Calculus · Differentiation rules

The cost of … shares of stock at … dollars per share…

The cost of $u$ shares of stock at $v$ dollars per share is $uv$ dollars. Check dimensions of $d (uv) / d t$ and $u d v / d t$ and $v d u / d t$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §2.5 The Product and Quotient and Power Rules, #40

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