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Lets assume that the monthly salary of the Rani is = $ X
Rani gives 60% of her salary to her mother & spends 15% of her salary so saving = (100-75)X/100 = 25X/100
130 + 15X/100= 25X/100
130 = 10X/100
x= $ 1300
The monthly salary of the Rani is = $ 1300