A fruit vendor ordered some fruits. 35% of the fruits he ordered were starfruits and the rest were dragonfruits. Each starfruit cost $2.50 and each dragonfruit cost 40% more than each starfruit. The vendor paid a total of $756.

1. Find the total cost of the starfruits.
2. How many dragonfruits did he order?

(a)

	Starfruits	Dragonfruits
Numbers	7 u	13 u
Price	$2.50	$3.50
Total value	17.5 u	45.5 u

35% = ³⁵₁₀₀ = ⁷₂₀

Number of starfruits = 7 u
Number of dragonfruits = 20 u - 7 u = 13 u

Price of each starfruit in percent = 100%
Price of each dragonfruit in percent = 100% + 40% = 140%

Price of each dragonfruit
= 2.50 x 140%
= 2.50 x ¹⁴⁰₁₀₀
= $3.50

17.5 u + 45.5 u = 756
63 u = 756
1 u = 756 ÷ 63 = 12

Cost of the starfruits
= 7 u x 2.50
= 7 x 12 x 2.50
= $210

(b)
Number of dragonfruits ordered
= 13 u
= 13 x 12
= 156

Answer(s): (a) $210; (b) 156