Mashaal Masha
Tilly earns $p$ dollars for every $w$ hours of work. Which expression represents the amount of money, in dollars, Tilly earns for $39w$ hours of work?
Difficulty: Easy
A: 

$39p$

B: 

$\frac{p}{39}$

C: 

$p+39$

D: 

$p-39$

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