boiling point using molal constant

The molar mass of a nonvolatile solute is 176.0 g/mol. Compute the boiling point of a solution containing 68.0 g of the solute and 750.0 g of water, when thebarometric pressure is such that pure water boils at 99.825 °C. (Kb= 0.52 °C/m)
A) 101.2 °C
B) 100.1 °C
C) 99.8 °C
D) 98.5 °C
E) 102.4 °C

I keep getting B) but it tells me the answer is A)


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