Under certain conditions, cane sugar with water is converted into dextrose at a rate which is  proportional to the amount unconverted at any time t. If initially there was 75 grams of cane  sugar with water and that 8 grams are converted during the first 30 minutes, find (a) the amount  converted in 1.5 hours, in grams; (b) the time at which 99% of sugar cane with water had been  converted to dextrose.

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