Santa bought eggs at ₹8.40 a dozen. At what price per hundred must

1.	Santa bought eggs at ₹8.40 a dozen. At what price per hundred must she sell them so as to earn a profit of 15% ?
Answer» Cost of a dozen eggs = 8.40 cost of 1 egg = 8.40/12 (since , 1 dozen = 12 eggs) => rs 0.7 cost of 100 eggs = 0.7 × 100 => rs 70 CP = rs 70gain % = 15% sp = (100+gain%)/100 × cp=> sp = (100+15)/100 × 70=> sp = 115/100 × 70=> sp = 115×7/10=> sp = rs 805/10=> sp = rs 80.5

Santa bought eggs at ₹8.40 a dozen. At what price per hundred must she sell them so as to earn a profit of 15% ?

Answer»

Cost of a dozen eggs = 8.40 cost of 1 egg = 8.40/12 (since , 1 dozen = 12 eggs)

=> rs 0.7

cost of 100 eggs = 0.7 × 100 => rs 70

CP = rs 70gain % = 15%

sp = (100+gain%)/100 × cp=> sp = (100+15)/100 × 70=> sp = 115/100 × 70=> sp = 115×7/10=> sp = rs 805/10=> sp = rs 80.5