137. Solving a chemistry problem

Chromatographic analysis showed that the mixture contains toluene, styrene, and cumene with peak areas of 151, 219, and 91 mm2, respectively. Then standard mixtures were introduced with a concentration of toluene 2 mg / l, styrene and cumene 3 mg / l, and benzene 1 mg / l. The peaks obtained had areas of 63, 94, 88, and 37 mm2 for toluene, styrene, cumene, and benzene, respectively. Calculate the percentage of components in the sample. Take benzene as a standard.