quick solving

a Figure (1) shows the block diagram of a wideband frequency modulator using the indirect method. This modulator is used to transmit audio signals containing frequencies in the range of 100 Hz to 15 kHz. The narrowband is supplied with a carrier of frequency fl=0.1 MHz by crystal- controlled oscillator also B=0.2, a second crystal- controlled oscillator supplied a sinusoidal wave of frequency 9.5 MHz to the mixer. The system Carrier frequency at the transmitter output, fc=100MHz Minimum frequency deviation, Af=75, find nl and n2? f(t) NBFM Freq. Multiplier 1 Mixer Freq. Multiplier 2 FM(t) Oscillator 1 Fig. (1) Oscillator2