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Lecture

# 157IQsol3.pdf

2 Pages
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School
Simon Fraser University
Department
Mathematics
Course
MATH 157
Professor
Stephen Choi
Semester
Fall

Description
MATH 157 - D100A SSIGNMENT #3 Due date: Wednesday Jan 25, 2012 Instructor Questions accompanying paper Assignment # 3 Solution Directions: Print double sided, write your solutions to both questions directly on this page, place immediately after cover page and staple together! Marks: An answer without a detailed solution process will be awarded zero marks! Q1: The annual sales of Crimson Drug Store are expected to be given by S(t) = 2:3 + 0:4t million dollars t years from now, whereas the annual sales of Cambridge Drug Store are expected to be given by S(t) = 1:2 + 0:6t million dollars t years from now. When will the annual sales of Cambridge ﬁrst surpass the annual sales of Crimson? Solution: Set 2:3 + 0:4t = 1:2 + 0:6t. We solve for t and get 1:1 = 0:2t or t = 5:5. When 5 and half years, the annual sales of Cambridge ﬁrst surpass the annual sales of Crimson. DR. SHOI,PRIN2012
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