The cost of 10 kg of mangos is equal to the cost of 24 kg of rice. The cost of 6 kg of flour equals the cost of 2 kg of rice. The cost of each kg of flour is $21. Find the total cost of 4 kg of mangos, 3 kg of rice and 5 kg of flour?  Select the correct option:
A) 347.8
B) 987.8
C) 877.8
D) 898.8
E) 667.4
Let the costs of each kg of mangos and each kg of rice be $a and $r respectively.   10a = 24r and 6 * 21 = 2r   a = 12/5 r and r = 63   a = 151.2   Required total cost = 4 * 151.2 + 3 * 63 + 5 * 21   = 604.8 + 189 + 105= 
<gadget id="calculator">604.8 + 189 + 105</gadget>
<output>898.8</output>
$898.80   898.8
<result>D</result>
The cost of 10 kg of mangos is equal to the cost of 24 kg of rice. The cost of 6 kg of flour equals the cost of 2 kg of rice. The cost of each kg of flour is $21. Find the total cost of 4 kg of mangos, 3 kg of rice and 5 kg of flour?