The juice stall at the circus stocked just 2 brands of orange juice tetra packs. Brand A costs $1 per pack and brand B costs $1.5 per pack. Last week , brand A contributed to r% of stall’s revenue and accounted for s% of sales of juice tetra packs. Which of the following expresses r in terms of s?
Choose the correct choice from the following answers:
A) 100s/(150 – s)
B) 200s/(250-s)
C) 200s/(300-s)
D) 250s/(400-s)
E) 300s/(500-s)
1. Let the number of units sold be 100. Then n units of A are sold and (100-n) units of B are sold.   Total revenue= Revenue due to A + Revenue due to B   = (No.of units of A sold * Cost/unit of A) + (No.of units of B sold * cost/unit of B)   = s *1 + (100-s) *1.5   = s + (150-1.5s) --- (1)   2. But we know, revenue due to A = r%. of the total revenue --- (2)   3. To express r in terms of s we need to relate (1) and (2)   4. r% = s / ( s + (150-1.5s))   or r= 100s / 150-0.5s = 200s/(300-s)   200s/(300-s)
<result>C</result>
The juice stall at the circus stocked just 2 brands of orange juice tetra packs. Brand A costs $1 per pack and brand B costs $1.5 per pack. Last week , brand A contributed to r% of stall’s revenue and accounted for s% of sales of juice tetra packs. Which of the following expresses r in terms of s?