What is the value of $5+4\cdot 5+4\cdot5^2+4\cdot 5^3+4\cdot5^4+4\cdot5^5?$

What is the value of $5+4\cdot 5+4\cdot5^2+4\cdot 5^3+4\cdot5^4+4\cdot5^5?$

A. $5^6$
B. $5^7$
C. $5^8$
D. $5^9$
E. $5^{10}$

Answer: A

Source: GMAT Club Tests

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