[{"_id":ObjectId("6300db81604458b99283a79b"),"name":"Product","mrp":"200","yourPrice":152,"fromVendor":"62f156491b7a7c055f7c580e","stock":99,"sku":"KT86T2F2V5","totalSold":1,"status":"active","images":[],"createdAt":ISODate("2022-08-20T13:02:57.013Z"),"updatedAt":ISODate("2022-08-20T13:02:57.013Z"),"__v":0},{"_id":ObjectId("6300dbb7604458b99283a79d"),"name":"Product1","mrp":"2000","yourPrice":1500,"fromVendor":"62f156491b7a7c055f7c580e","stock":4,"sku":"XXSNRDI48V","totalSold":0,"status":"draft","images":[],"createdAt":ISODate("2022-08-20T13:03:51.212Z"),"updatedAt":ISODate("2022-08-20T13:03:51.212Z"),"__v":0}]

db.collection.aggregate([{$match:{status:"active",stock:{$gt:0},}},{$addFields:{discount:{"$multiply":[{$divide:[{$subtract:[{$toInt:"$mrp"},"$yourPrice"]},{$toInt:"$mrp"}]},100]}}}])