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Wheatstone bridge question help

Hi, all i am stuck on a question about a Wheatstone bridge circuit and an amp, the question is as follows.

Figure 1 shows a Wheatstone bridge used to make a musical instrument from a strain gauge (resistor R1R1) attached to a metal bar and three other strain gauges used as fixed resistors on the circuit board. When the bar is struck, the strain causes changes in R1R1 only. The change in resistance is ΔR1R1=0.2 Ω per microstrain (i.e. 0.2 Ω for a strain of ε= 10-6) and the initial value of R1R1 is 119 Ω.



VsVs=0.7 V, R2R2=119 Ω, R3R3=122 Ω and R4R4=122 Ω.

(iv) Imagine that we want the strain measurement system to give an output of peak amplitude 1 volt. The Wheatstone Bridge is a sub-system whose output is the source signal to a voltage amplifier sub-system. What gain is required of the voltage amplifier to increase the peak amplitude of the output voltage from the values determined in part (iii) to 1 V? Enter your answer as an integer (whole number) value.


any help would be amazing, thanks
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