Add all the like terms together
4x+4y+10
Number of ways to choose 3 red = 5C3 = 10
number of ways to choose 2 blue = 5C2 = 10
C represents combination
(5C3)*(5C2) = 10 * 10 = 100 ways
Let amount invested at 8% per year = x
Let amount invested at 14% per year = y
Total investment is $94000 then we get equation:
x+y=94000
or
x=94000-y...(i)
Given that total return in 1 year is $8720 so we can write equation:
8% of x + 14% of y = 8720
or
0.08x+0.14y=8720...(ii)
plug (i) into (ii)
0.08(94000-y)+0.14y=8720
7520-0.08y+0.14y=8720
7520+0.06y=8720
0.06y=8720-7520
0.06y=1200
y=20000
plug value of y into (i)
x=94000-y=94000-20000=74000
Hence final answer is given by:
Amount invested at 8% per year = $74000
Amount invested at 14% per year = $20000
Answer = 13%
Explanation:
Total number of people who bought a hot sandwich = 2 + 7 + 6
Total number of people who bought a hot sandwich = 15
Total number of people who bought a hot sandwich and did not buy a drink = 2
Visitors who purchased a hot sandwich and did NOT buy a drink = 2 /15
Percentage of Visitors who purchased a hot sandwich and did NOT buy a drink = 2 /15 *100
= 13.2222%
Rounding off would be 13%